14 best one way check valve

• The check valves are for common aquarium air pumps. Please DO NOT use them with CO2 system. Great one way check valve for aquarium and fish tank.
• Protect you air pump by preventing aquarium water from back siphoning during a power outage.
• Made of durable clear plastic. Net weight: 0.14 oz / 4 g. Please use a paperclip to poke it from Input side to Output side when the outlet inside gets stuck.
• Air Hole Diameter: 0.15" / 4mm; Overall Size: 2.1" x 0.58" / 5.3 x 1.5 cm (L*Max.D)
• Package Content: 6 Pcs x Air Check Valve

User questions & answers

Question:	Are these ball and spring
Answer:	Standard aquarium hose 3/16" ID hose will fit. Used it with PENN PLAX Standard Airline Tubing without any problems
Question:	What type of plastic is it made of
Answer:	NO ! But they work Great
Question:	What size hose are these made for
Answer:	you can blow air one way only and that is into your aquarium. The other way around the check valve will stop it. That way no water is leaking into your air pump.
Question:	does anyone know the maximum flow rate on these check valves
Answer:	i never heard any noises

Product features

6 Pack Red One Way Valves

The non-return air pump check valves are made of durable plastic materials and designed to fit most common aquarium air pump while making no noise. Keep your air pump from getting water running into your pump when doing water changes or when the power is interrupted. Perfect for aquariums, fish tanks and gardening etc.

Note: Please don't place the air valves in CO2 system because the high pressure will make them crack and leak.

How to Install

1. Before use, clean and dry both sides of the tubing so as to hook up valve tightly.

2. Check the flow direction of the valve to make sure put on the correct sides.

3. Attach air pump check valve to the tubing carefully and connect completely.

Tips: If the valve restricts air flow in both directions, please poke something into the hole on the inlet side to push open the valve. After that the valve would allow airflow in the right direction.

Good at Prevention

The air check valve protects you air pump by preventing aquarium water from back siphoning during a power outage.

Practical Application

Fits for standard 3/16 inch airline hoses. Can be used for aquariums, fish tanks and gardening etc. But DO NOT place them in CO2 system.

Safe and Durable

Clear rigid plastic materials allow you to get rid of breaking the inlet off easily or leaking air. Work for a long time without making noise.

• Function: The basic design of a one way check valve inhibits back flow in a line. Arrow marked on valve, showing fluid flow direction, preventing fuel from returning back to the tank and keeps it in the line. In this way, this product can perfectly solve the problem that your vehicle is hard or slow starting issues
• Feature: The non return check valve body is made of high quality aluminum alloy can use longer than plastic one. Stable characteristics, high reliability. The push lock design of the connector stop the hose from sliding off and easy to connect. Surface anodized for great appearance and anti-corrosion, superior thread strength
• One-way Check valve installs in many diesel / bio fuel systems / Carburetors and low pressure fuel systems where you desire fuel to only flow one way. Suitable for water, petrol, diesel, oil, and other fluids. Note:This fuel non return one way check valve cannot be used in methyl alcohol because formic acid will be produced while it is powered on, which will lead to the uselessness
• Easy installation and replacement. According to the little arrow on the valve, connect the fuel line. You can use some hose clamps which can make sure the pipes don't drop off. The main advantage of a non-return check valve is its simple design. This simple design make the check valves has a small size and easy to install, making maintenance easier and more efficient
• The minimum upstream pressure required to operate the aluminum one-way check valve is 2.9psi (0.2 bar). Working pressure:2.9-87 psi (0.2-6bar) Operating temperature: -30 ℃ - 130 ℃. Six-month warranty provide by EVIL ENERGY. We value your shopping experience and strive to offer a high-quality product and service

User questions & answers

Question:	Can this valve be opened an closed with your lungs pressure easily
Answer:	It is designed to return to neutral.
Question:	es this work on a fuel injected system? Back flow issue on a 2002 Nissan Sentra
Answer:	No, this is a fixed on-off-on air switch. I believe Clippard does make a mom on-off-on one though. Check out their website for the part number.
Question:	Will the 6mm(1/4") check valve fit into a 1/2" hole on gas tank to be used on end of gas tank siphon tube in the tank
Answer:	No, there is no port on the bottom. One at the rear, 2 on the top (one of which is the exhaust)
Question:	Would this valve be effective in a air/vapor system
Answer:	Not unless you have a lock that is air actuated. It is an air valve

Product features

3/8" One Way Fuel Check Valve

Installation

Easy to install. Hose clamps are highly recommended.

Arrow marked on valve, showing fluid flow direction.

FAQ

Product description

Features:

The one-way valve, made with high-quality materials, and also with advanced technology and equipment.

Hand Pump is screw onto the suction valve of oil transfer/feed pump, when the engine is at rest, from diesel fuel tank pump into the oil transfer pump.



We also have many other sizes,please search in our store.

• Material: High Quality Aluminum Alloy
• Application:For Carburetors and low pressure fuel systems(Petrol / Diesel /Fuel)
• Package Included:1x Fuel Check Valve. (100% Brand New Never Used Or Installed)
• Size: 12mm(1/2")
• color:black

User questions & answers

Question:	Will this work for a vent line to keep fuel from coming out when the tank is full
Answer:	this one is 10mm one way check valve ,just fit with 3/8" hose
Question:	are this safe for e
Answer:	yes, the valve can works in air system
Question:	Will this check valve work with a fuel injection system in a vehicle
Answer:	latching in both positions.
Question:	Will this work for vaccume pcv ? Automotive
Answer:	Hi Mark, The ports are 10-32 threads and I buy fittings and line from one of two places: https://www.airengr.com http://www.hartfiel.com/

Product description

Feature:



Effective performance:

Our check valves can effectively prevent countercurrent liquids for fluid system or backward flow of compressed air for pneumatic system.



Versatile applications:

These check valves are suitable for applying for automotive part, machinery industry, household appliances, agriculture and so on, a practical and necessary tool for you to choose.



Specification:

Material: PVDF

Diameter: approx. 6.3 mm/ 1/4 inch

Full length: approx. 38 mm/ 1.5 inches

Color: white



Package content:

2 x PVDF check valves



Note:

Manual measurement, please allow slight errors on size.

• Effective performance: our check valves can effectively prevent countercurrent liquids for fluid system or backward flow of compressed air for pneumatic system
• Durable material: made of quality PVDF material which is stable and durable to use, has nice wear-resistant feature, not easy to rust or break, can support for long time using
• Size information: our check valve measures approx. 6.3 mm/ 1/4 inch in diameter and 38 mm/ 1.5 inches in full length, please make sure the size is suitable for your needs before purchasing
• Considerate design: our pipe port of the check valve is designed with a pagoda-shaped card slot, non-slip and non-toxic to use, contains good airtightness and adsorption function, convenient to install and operate
• Versatile applications: these check valves are suitable for applying for automotive part, machinery industry, household appliances, agriculture and so on, a practical and necessary tool for you to choose

User questions & answers

Question:	How can I tell what direction is the flow direction? There are no markings for flow direction on the item
Answer:	Sorry,it works for fulids.So it won't work for a vaccume pcv .
Question:	If the valve was inserted at base of a tube full of 12oz of water, valve pointed to allow water down, Would the valve leak
Answer:	I tried it and it worked.
Question:	Since there were no instructions or markings on the outside, i need to know if they need to be mounted facing a certain direction for proper flow
Answer:	all this does is stop fuel from draining back into the tank ,not sure

Product description

About A ABIGIAL 2 PCS 1/4" 6mm Non Return One Way Check Valve for Fuel Line Oil Petrol Diesel Aluminium Silver



- Easy to install and replace.

- Stable characteristics, high reliability.

- Fit for Carburetors and low-pressure fuel systems.

- Fit for water pressure pumps & galley pumps which are not self-priming, Ideal for marine, automotive, caravans/RV, and agriculture.

- Arrow marked on valve, showing fluid flow direction, Prevents fuel from returning back to the tank and keeps it in the line.



Specifications:

- Color: silver

- Material: Aluminum Alloy

- Suits: 6mm (1/4") ID hose

- Opening pressure: 0.2 bar

- Working pressure range: 0.2 - 6 bar

- Operating temperature range: -30°C - 130°C

• 【High Quality】This check valve made of premium aluminum alloy can use longer than the plastic one. Stable characteristics, high reliability.
• 【Features】The push-lock design of the connector stop the hose from sliding off and easy to connect. it prevents fuel from returning back to the tank and keeps it in the line.
• 【Application】This inline check valve is suitable for petrol, diesel, water, oil. Great for water pressure pumps and galley pumps which are not self-priming. Ideal for marine, automotive, caravans/RV, and agriculture.
• 【Easy Installation】Arrow marked on the valve, refer to the arrow while connecting the fuel line. Opening pressure: 0.2 bar, Working pressure range: 0.2 - 6 bar, Operating temperature range: -30°C - 130°C.
• 【Service】100% satisfaction guarantee, If you have any issues with the part, simply contact customer service for troubleshooting help, parts, replacement, or refund. Our aim is to make you satisfy the parts and the service we provide for you.

Product description

Specifications:

Shell material: ABS resin

Diaphragm material: silicon rubber

Diameter: 10mm/0.39 inch

Total length: 43mm/1.69 inch

Opening pressure: ≤0.5 Kpa

Maximum back pressure: ≥0.3 Mpa

※Medical grade material, safe and nontoxic;

※Strong resistance to acid, alkali, salt corrosion ability;

※Under 25 Degrees Celsius ~ 60 Degrees Celsius environment is normal performance, and has good form ability.

※Used in fluid system to prevent reverse flow flow, or used in pneumatic system to prevent reverse flow of compressed air.

Package include:

2x Check Valve

• Material ※ The shell material is ABS resin, and the Diaphragm material is silicon rubber
• Performance※ Normal performance under 25 ℃ to 60 ℃,Strong resistance to acid, alkali, salt corrosion ability
• Application ※Check valve is used in fluid system to prevent reverse flow fluid, or used in pneumatic system to prevent reverse flow of compressed air
• Diameter ※ 10mm/0.39 inch
• Total length ※ 43mm/1.69 inch

User questions & answers

Question:	would this valve open with a slight suction on the secondary side? Reverse flow is not a concern for me
Answer:	Not a good idea. 69 psi at what volume? I think the internal components will shread.... all plastic construction looks to be best for low volume and low pressure. I put mine in a line to prevent back siphoning on a drain tube.
Question:	How many GPM is the minimum for this to open up
Answer:	This unit is small. They have 3/8 fittings for tubing with the inside diameter. If your tubing is that size it will probably work. Check with your local aquarium store.
Question:	Can this check valve handle 60 psi of gas/air flow as well back pressure
Answer:	This is intended for liquid I think? They make them for air compressors. This one on Amazon has 3/4 pipe threads. Your air comp uses tubing and it has a nut and ferrel with different (fine) threads is my guess without seeing what you have. I'm thinking you have a large shop or industrial compressor to use a 3/4 pipe in the check valve. Send me a pic if you like and I try help you.
Question:	Can you squeeze this into standard aquarium air tube
Answer:	This is to stop water running back from an "uphill" discharge. If I understand you the line drains on it's own? I don't think it would work for that as it needs pressure to open or close.

• Diameter:0.85"
• Overall length:2.4"
• Suits:3/8" ID hose
• Material: Aluminum Alloy
• Easy installation and replacement

Product features

NovelBee 3 Pack of 3/8" Aluminum Alloy One Way Fuel Non Return Check Valve for Petrol Diesel Oil Water

• Check Valve Diameter:0.85"

• Check Valve Overall length:2.4"

• Check Valve Suits:3/8" ID hose

Product description

AN male flare chect valve:

Comes in different sizes. Pls contact us for more product information.

ANTI-LEAK, ANTI-BACKFLOW — When installed correctly (check the arrow on the piece to know the correct side)

Ensures that the water and air circulations are consistent and going in the right direction without any backflow

Ideal fuel systems where a check is required inline

• Inlet Size: -6 AN Male Flare Outlet Size: -6 AN Male Flare (9/16"x18), One Way Check Valve with Spring Design Inside Parts, Full Length 56.8MM, Made of Aluminum Alloy
• Positive Seal, High flow capacity and Positively Stops Fluid From Returning
• Suits Fuel Pressure Systems, Oil Pressure Systems, Transmission Cooling lines, Air Systems, Fuel Cell Breather (With Cracking Spring Removed)
• These one way poppet valves perfect all fuel applications
• For Aquariums - Positive Seal, Sturdy, Reliable, Anti-Leak, Anti-Backflow, Non-Return CO2 Air Valve That Ensures One Directional Water Flow

User questions & answers

Question:	Can this be used for diesel
Answer:	Hello, this product is very simple to use, as long as it is connected between 2 tubes, hope it can help you. Thanks.
Question:	How long will this check valve hold 40-50PSI
Answer:	It should
Question:	Is this Ethanol Safe
Answer:	I don't know. I used mine on a diesel tractor.
Question:	Can these be used in a vacuum application? What is opening pressure
Answer:	Fuel injection systems generate very high pressures. Would only install original equipment on the system....with correct specifications and connectors. No fuel leaks...no fires !!!

Product description

Specifications:

Shell material: PA66 (Nylon)

Diaphragm material: VITON

Spring material: SUS316L

Diameter: 4.5mm/0.177 inch

Total length: 40mm/1.57 inch

Opening pressure: ≤1 Kpa

Maximum back pressure: ≥300K pa

※The pipe port designs a pagoda card slot, non-slip, good airtightness, the port outer diameter is available in 4 sizes, suitable for 3.2 to 9MM inner hole hose to connect, user-friendly design, easy to use

※Self-contained gas flow direction signs on the valve body for convenient installation. Avoid repeated installation and debugging work

※Under 25 Degrees Celsius ~ 135 Degrees Celsius environment works. Reliable quality, no need to worry about high temperature damage in the cabin

※Used in automotive system to prevent backflow of gases or liquids in the piping. One-way valves are commonly used in brake boosters - air conditioning damper ducts - exhaust valve ducts and wiper sprinkler ducts on automobiles. The one-way valve is widely used and can be reasonably used according to individual needs.

Package include:

2x Check Valve

• Size※4.5mm (3/16")
• Total length ※ 40mm/1.57 inch
• Material ※ The shell material is PA66, and the Diaphragm material is VITON，the spring material is SUS316L
• Performance※ Normal performance under -25 ℃ to 135 ℃, Strong resistance to High Temperature and Corrosion
• Application ※One-way valves are commonly used in brake boosters - air conditioning damper ducts - exhaust valve ducts and wiper sprinkler ducts on automobiles. The one-way valve is widely used and can be reasonably used according to individual needs.

User questions & answers

Question:	Is this food grade
Answer:	I use these valves in exactly the way you describe with excellent results. They stop winshield washer fluid from getting dirty?

• 【Warranty】12 months. (Long life with high temperature and durable materials,high reliability)
• 【Product Size】10 mm (Diameter) (3/8")ID (inner diameter) hose -- Color: Silver
• 【100% Qualified Materials】High quality and durable aluminum alloy material for extended service life
• 【Application】10mm fuel check valve 3/8 Suitable for any UTV, Side by side, Quad, Dirtbike, Jetski, Waverunner, Boat, Truck, Car, Motorcycle, Tractor, Camper, Lawn Mower, Blower, Pressure washer, etc...
• 【Easy Installation and Service Guaranteed】3/8" check valve High qualified and safe aluminium alloy materials, Easy installation and 100% rigorous tested before shipment. Quality comparable to the original factory.

User questions & answers

Question:	How much pressure does it take to open
Answer:	Less than a minute.
Question:	Suitable for automotive vacuum
Answer:	Yes
Question:	What is the max pressure this valve can handle
Answer:	I don't think so, this is used for fuel line for race car.
Question:	Do you sell anything bigger than 12mm? I need a 14mm one for oil and fuel
Answer:	Yeah, I had that problem too. I just used a little compressed air. Trying one side then the other. In short order it became clear which was which. I then quickly marked the input side with a magic marker so I did not have to repeat the process. Without a compressor you could just blow on one end or the other with your lips, however, these days, I'd wash the device first.

Product features

Product Dimensions

• Material: Body material→High quality wear resistant, corrosion resistant Aluminum Alloy material. Spool material→Tetrafluororubber.
• Color: Silver
• Inlet Thread: 1/4”/6mm
• Size: 6mm(1/4”) ID hose
• Package content: Pack of 1pcs 6mm(1/4”) One Way Non-return Check Valve - Fuel/Diesel/Water/Marine

Product Dimensions

• Material: Body material→High quality wear resistant, corrosion resistant Aluminum Alloy material. Spool material→Tetrafluororubber.
• Color: Silver
• Inlet Thread: 5/16"/8mm
• Size: 8mm(5/16") ID hose
• Package content: Pack of 1pcs 8mm(5/16") One Way Non-return Check Valve - Fuel/Diesel/Water/Marine

Product Dimensions

• Material: Body material→High quality wear resistant, corrosion resistant Aluminum Alloy material. Spool material→Tetrafluororubber.
• Color: Silver
• Inlet Thread: 3/8"/10mm
• Size: 10mm(3/8") ID hose
• Package content: Pack of 1pcs 10mm(3/8") One Way Non-return Check Valve - Fuel/Diesel/Water/Marine

Product Dimensions

• Material: Body material→High quality wear resistant, corrosion resistant Aluminum Alloy material. Spool material→Tetrafluororubber.
• Color: Silver
• Inlet Thread: 1/2"/12mm
• Size: 12mm(1/2") ID hose
• Package content: Pack of 1pcs 12mm(1/2") One Way Non-return Check Valve - Fuel/Diesel/Water/Marine

Please Note:

This Fuel Non-Return/One Way Check Valve cannot suitable for methanol, because the methanol will produce formic acid, which will corrode the inside of the product, which will lead to product failure.

Four Sizes For Available Satisfy Your Demand

• 6mm 1/4" ID hose One Way Non-Return Check Valve
• 8mm 5/16" ID hose One Way Non-Return Check Valve
• 10mm 3/8" ID hose One Way Non-Return Check Valve
• 12mm 1/2" ID hose One Way Non-Return Check Valve

Applications

• Great for Not Self-Priming Water Pressure Pumps and Galley Pumps.
• Fit for Carburetors and Low Pressure Fuel Systems.
• Ideal for marine, automotive, caravans/RV, and agriculture.
• Suitable for fuel injection, water, diesel, petrol, oil and other fluid.

Features

• Professional Grade one way non-return check valve.
• Stable performance and high reliability.
• Easy to install and replace.
• This valve prevents fuel from returning to the tank and keeping it in the fuel line. If a vehicle starts hard or slow, the fuel is returning back through the lines , which will solve all your problems.

Long Lifetime

• Carburetor and low pressure fuel system. Product life of aluminum head is longer than plastic head.
• Hundred Percent satisfaction and responsible for comprehensive after-sales service. .

Product description

Specifications:

Shell material: ABS resin

Diaphragm material: silicon rubber

Diameter: 10mm/0.39 inch

Total length: 43mm/1.69 inch

Opening pressure: ≤0.5 Kpa

Maximum back pressure: ≥0.3 Mpa

※Medical grade material, safe and nontoxic;

※Strong resistance to acid, alkali, salt corrosion ability;

※Under 25 Degrees Celsius ~ 60 Degrees Celsius environment is normal performance, and has good form ability.

※Used in fluid system to prevent reverse flow flow, or used in pneumatic system to prevent reverse flow of compressed air.

Package include:

1x Check Valve

• Diameter ※ 10mm/0.39 inch
• Total length ※ 43mm/1.69 inch
• Material ※ The shell material is ABS resin, and the Diaphragm material is silicon rubber
• Performance※ Normal performance under 25 ℃ to 60 ℃,Strong resistance to acid, alkali, salt corrosion ability
• Application ※Check valve is used in fluid system to prevent reverse flow fluid, or used in pneumatic system to prevent reverse flow of compressed air

User questions & answers

Question:	Can these be used for pond aeration to prevent water back up when the air source is turned off
Answer:	It is automotive grade. The materials listed in the description all seem fine for food, but if your project is commercial these check valves would not be a good choice. Just my opinion.
Question:	What is is the maximum operating pressure for this
Answer:	yes

Product description

Feature:

1) The life of Aluminum head for using is longer than plastic heads

2) Arrow marked on valve, showing fluid flow direction, Prevents fuel from returning back to the tank and keeps it in the line.

3) Also great for water pressure pumps & galley pumps which are not self-priming

4) Professional grade non-return valve - Ideal for marine, automotive, caravans/RV, and agriculture.

5) Stable characteristics, high reliability.

6) Easy installation and replacement.

Package Including:

3 × 10 MM-way valve check

• Suits:10mm (3/8") ID hose
• Dimension:Overall Length 60mm x Diameter 22mm
• Material: Aluminum Alloy
• Compatible: Suitable for water, petrol, diesel, oils, and other fluids
• There might be a 1-2mm error on the basis of different measuring methods, it is in normal range. Pls measure the size before purchase.

User questions & answers

Question:	Would these hold air in a vacuum/ boost application
Answer:	yes
Question:	Will these work as a check valve in an air line
Answer:	I don't k now.
Question:	Could this be used for water in a fresh water aquarium setup? Will it harm the fish
Answer:	We are not the vendor.

Product description

Features

1. Prevents fuel from returning back to the tank and keeps it in the line.

2. Fit for Carburetors and low pressure fuel systems.

3.The life of aluminum head is longer than plastic head.

4.Easy installation and replacement.

Specification

Material :Aluminum

Color : Silver

Diameter : 6mm / 1/4" 8mm/5/16" 10mm/3/8"

Opening pressure: 0.2 bar

Working pressure range: 0.2 - 6 bar

Operating temperature range: -30°C - 130°C

Package include

2x Fuel Non Return Check Valve

• ONE WAY CHECK VALVE, installed high quality valve flap, this check valve would well prevent fuel from returning back to tank and keep it in line. It can significantly solve Slow startup issues of your vehicle.
• FEATURES, non return check valve is made of premium Aluminium Alloy, well mould, the life of aluminum head is longer than plastic one, more reliable. Strong thread connector, anti-slide design, you may use a clamp to make sure the pipe won’t drop off if necessary.
• APPLICATION, this inline check valve is suitable for petrol, diesel, water, oil. It is applicable to many diesel / bio fuel systems / Carburetors and low pressure fuel systems where you desire fuel to only flow one way.
• EASY INSTALLMENT, Push lock design of the connector stop the hose from sliding off and easy to connect. Arrow marked on valve, refer to the arrow while connecting the fuel line. There’s three size for your choice, please pick up the suitable one according to your pipes size.
• PARAMETER, Opening pressure: 0.2 bar, Working pressure range: 0.2 - 6 bar, Operating temperature range: -30°C - 130°C. 1 year with 100% satisfaction and zero hassle returns guarantee.

User questions & answers

Question:	What Aluminium Alloy is this made with? Does it contain lead
Answer:	The water will back up to the point of the check valve but not beyond. I’m not sure what psi the valve is rated for, but unless it’s very deep it should be fine.
Question:	Will this work with a vacuum
Answer:	Check valve are used on suction side.
Question:	Will it work for with windshield wiper fluid
Answer:	Less than a pound.

Product description

Description:



- Fits for Carburettor and low pressure fuel systems. For Use With Petrol, Diesel, Bio / Vegetable oil, Paraffin / Kerosene oil, etc.



- Arrow marked on valve, showing fluid flow direction, Prevents fuel from returning back to the tank and keeps it in the line.



(not suitable for methanol, because the methanol will produce formic acid, it will corrode the inside of the product, which will lead to product failure)



Specifications:



Material:

- External material: High Quality Aluminum Alloy

- Internal material: High Quality NBR Rubber



Product size: 8MM



Product weight: 21g.



Advantages: diesel, gasoline, aging resistance



Opening pressure: 0.2 bar



Working pressure range: 0.2-6 bar



Working temperature range: - 30 ℃ to 130 ℃



Scope of application: car, ship, helicopter, ship, motorcycle and other fuel systems



Use medium: diesel, gasoline, water, etc.



(not suitable for methanol, because the methanol will produce formic acid, it will corrode the inside of the product, which will lead to product failure)



Package Content:



3 x Fuel Non Return Check Valve (8mm)



6 x Hose clamp

• 【Fitment】Fits for Carburettor and low pressure fuel systems. For Use With Petrol, Diesel, Bio / Vegetable oil, Paraffin / Kerosene oil, etc.
• 【Size】8mm (5/16").
• 【Material】Aluminum. Color: Chrome. Composed by aluminum alloy, light-weight and durable.
• 【Function】Arrow marked on valve, showing fluid flow direction, Prevents fuel from returning back to the tank and keeps it in the line.
• 【Package includes】3 pcs One Way aluminium Fuel Non Return Check Valve. 6 pcs Hose clamp.