14 best compression union fittings
Compression union fittings are commonly used in plumbing and fluid systems to join two pipes or tubing sections together securely.These fittings are designed to create a leak-proof connection without the need for soldering or welding. They are particularly useful in situations where pipes or tubing need to be disconnected and reconnected periodically for maintenance or repairs.
Here are some key features and information about compression union fittings:
Design: Compression union fittings typically consist of three main components: the nut, the compression ring (also known as the ferrule), and the body. The body is usually made of brass, stainless steel, or other materials suitable for the specific application.
Sealing Mechanism: The compression ring is the key component responsible for creating a tight seal. When the nut is tightened onto the body, it compresses the ring around the pipe or tubing, creating a secure and leak-proof connection.
Versatility: Compression union fittings are versatile and can be used with various types of tubing or pipe materials, including copper, plastic, and stainless steel. This versatility makes them suitable for a wide range of applications in plumbing, HVAC systems, industrial processes, and more.
Ease of Installation: One of the main advantages of compression union fittings is their ease of installation. They do not require special tools, soldering, or welding. The assembly process typically involves inserting the pipe or tubing into the body, placing the compression ring over it, and tightening the nut.
Reusability: Compression union fittings can be easily disassembled and reassembled without damage to the components. This makes them ideal for applications where periodic maintenance or adjustments are necessary.
Pressure Rating: Compression union fittings are available in various sizes and pressure ratings to suit different system requirements. It's essential to select the right fitting size and material that matches the specific application's pressure and temperature conditions.
Leak Prevention: Proper installation is critical to ensure a leak-free connection. Over-tightening the nut can cause damage to the components and lead to leaks, so it's important to follow manufacturer guidelines and recommendations.
Applications: Compression union fittings find applications in a wide range of industries, including plumbing, HVAC (heating, ventilation, and air conditioning), hydraulic systems, pneumatic systems, and industrial processes.
In summary, compression union fittings are essential components in plumbing and fluid systems, providing a secure and reliable means of connecting pipes or tubing without the need for soldering or welding. They are known for their versatility, ease of installation, and reusability, making them a popular choice for various applications in the industrial and plumbing sectors.
Below you can find our editor's choice of the best compression union fittings on the market
Legines Brass Compression Tube Fitting, Union, 1/4" OD x 1/4" OD, Pack of 2
- Three piece construction - nut, sleeve and body with attached insert Use with copper, brass, aluminum, or plastic tubing
- Manufactured for low and medium pressure tubing connection work where excessive vibration or tube movement is not involved.
- Use with copper,aluminum and thermoplastic tub-ing.Not recommended for steel tubing.
- Not recommended for application using gas eous media.
- Meets specifications and standards of ASA, ASME asn SAE.
User questions & answers
| Question: | Is this 3/8 comp x 3/8 comp union the correct size to connect to the female 3/8 comp of a standard faucet supply line |
| Answer: | most 100lb test is .039 inch or 1mm. you would use a double sleeve with a 1mm max line diameter not 1mm sleeve id. I do not know about single sleeve I only use double sleeve. |
| Question: | Is the female a compression fit |
| Answer: | 180 |
Product features
Legines Brass Compression
- Three piece construction - nut, sleeve and body with attached insert Use with copper, brass, aluminum, or plastic tubing.
- Manufactured for low and medium pressure tubing connection work where excessive vibration or tube movement is not involved.
- Typical application: Use with copper, aluminum and plastic tubing.Not recommended for steel tubing and using gas eous media.
- Working pressure up to 2000psi with a 4:1safety factor depending on TUBE size.Temperature range of -65°F to 250°F (-53°C to 121°C).
Compression Union
The sleeve type pipe joint is composed of three parts: joint body, sleeve, nut. When the ferrule and the nut are inserted into the joint body on the steel pipe, when the nut is tightened, the outer side of the front end of the ferrule is fit with the conical surface of the joint body, and the inner edge bites into the seamless steel pipe evenly.
Solid Brass&Strong Structure
This union is made of forged Brass with ductility at high temperatures, low magnetic permeability, and is composed of three parts which can combine a strong connection.
Heavy duty and Clean threads
This is a heavy brass connector that does what it's supposed to do. Threads are cut correctly. The NPT threads create a tighter seal than straight threads.
Simple installation
Its installation is simple, high pressure, and therefore can be widely used.
4LIFETIMELINES Brass compression union, 1/4, 10/bag
4LifetimeLines
Product description
High quality brass for leak-proof reliability
- High quality brass for leak-proof reliability
- Our brake line unions are made with unmatched superior quality
- Made of durable brass which is resistant to corrosion from salt that can be used on roads in the winter
- Works with steel, copper nickel, copper coated steel, PVF-coated, and stainless steel lines
- Lifetime warranty included on all products purchased from 4Lifetimelines
User questions & answers
| Question: | What PSI are they rated |
| Answer: | We have them on our showers and it doesn't seem to affect the flow. |
LTWFITTING 1/4-Inch OD Compression Union,Brass Compression Fitting(Pack of 10)
Ningbo Haishu HuaxinYicheng Trade Co., Ltd.
Product description
Product Description
Durable and high standard brass compression union. Commonly used to connect lines for air, water, fuel, oil and inert gases in a quick and simple way.
Click "honest-f" to choose the product you want in our shop.
Features
- Package Include:10 pcs.
- Materies: brass.
- Net Weight: 23.1g/pc.
- Type: Compression Union.
- Tube Size:1/4" OD.
Important Note
Pay attention to the column of size and color, you could find a variety of product types and quantities for your choice.
The more your purchase the best price you get.
About Shipping
Great stock availability and fast dispatch are our core business. We would make effort to process each order within 24 hours.
We are international seller, each item is required to be checked by two customs. China Post Air Mail and epacket are our main carriers,it normally takes about 1-2 weeks to deliver to US.
If you do not receive the item during this period or have any problems, kindly contact us firstly.
You can rest assured we would handle each order no matter big or small as faster as we can.
About Us
We are honest seller, any problems please contact us before leaving your feedback. We will try our best to work out the issue with you.
These products come from our joint factory, its annual output is about 100,000,000 pcs. It is one of the main copperware maker in China with a 25 years¡¯ experience in producing copperware and has already passed ISO 9001 quality guarantee system attestation, to ensure the long-term and stable quality of products .
- Type: Compression Union
- Tube Size:1/4" OD
- Materies: BRASS
- Net Weight: 23.1g/PC
- Choosing products dimensions and quantities at column of size and colour seperately,price would be more favorable if choosing wholesale.
SUNGATOR 6-Pack Tube Fitting Lead Free Brass, Compression Union 3/8" x 3/8" Tube OD with a Sealing Tape
Product description
SUNGATOR 3/8 Inch Compression Union Set
Function:
Solid brass union for connecting and extending same size pipes or fittings.
Compression to compression tube union for connecting two 3/8 inch compression fitting tubes together.
No Pollution:
Lead-free brass, used for drinking and non-drinking water. No matter where you will use it, there is no need to worry about pollution.
Durable:
Heavy-duty brass construction with rust proof, lead free solid brass, more durable than iron or plastic materials, have a longer using life.
Great Sealing:
Prfessional deep and clean thread;
A sealing tape included, no worry for leakage.
Size:
3/8 Inch Compression x 3/8 Inch Compression.
Package Includes:
3/8 Inch Compression x 3/8 Inch Compression Union (6 pcs);
Sealing Tape (1 pc).
- 【Lead Free Brass】: Heath and environment friendly material. Lead free brass for both potable and non-potable water. 3/8" compression x 3/8" compression.
- 【Function】: Compression union for connecting two 3/8 inch compression fitting tubes together.
- 【Durable】: Brass for corrosion resistance, high temperature ductility and low magnetic permeability, have a longer using life than iron and iron galvanized products.
- 【Better Sealing】: A sealing tape included for further improving sealing performance by using on the male thread end.
- 【Package Includes】: 3/8" Compression x 3/8" Compression Union (6 pcs); Sealing Tape (1 pc).
LTWFITTING 3/8-Inch OD Compression Union,Brass Compression Fitting(Pack of 10)
Ningbo Haishu HuaxinYicheng Trade Co., Ltd.
Product description
Product Description
Durable and high standard brass compression union. Commonly used to connect lines for air, water, fuel, oil and inert gases in a quick and simple way.
Click "honest-f" to choose the product you want in our shop.
Features
- Package Include:10 pcs.
- Materies: brass.
- Net Weight: 34.7g/pc.
- Type: Compression Union.
- Tube Size:3/8" OD.
Important Note
Pay attention to the column of size and color, you could find a variety of product types and quantities for your choice.
The more your purchase the best price you get.
About Shipping
Great stock availability and fast dispatch are our core business. We would make effort to process each order within 24 hours.
We are international seller, each item is required to be checked by two customs. China Post Air Mail and epacket are our main carriers,it normally takes about 1-2 weeks to deliver to US.
If you do not receive the item during this period or have any problems, kindly contact us firstly.
You can rest assured we would handle each order no matter big or small as faster as we can.
About Us
We are honest seller, any problems please contact us before leaving your feedback. We will try our best to work out the issue with you.
These products come from our joint factory, its annual output is about 100,000,000 pcs. It is one of the main copperware maker in China with a 25 years¡¯ experience in producing copperware and has already passed ISO 9001 quality guarantee system attestation, to ensure the long-term and stable quality of products .
- Type: Compression Union
- Tube Size:3/8" OD
- Materies: BRASS
- Net Weight: 34.7g/PC
- Choosing products dimensions and quantities at column of size and colour seperately,price would be more favorable if choosing wholesale.
LTWFITTING 1/2-Inch OD Compression Union,Brass Compression Fitting(Pack of 5)
Ningbo Haishu HuaxinYicheng Trade Co., Ltd.
Product description
Product Description
Durable and high standard brass compression union. Commonly used to connect lines for air, water, fuel, oil and inert gases in a quick and simple way.
Click "honest-f" to choose the product you want in our shop.
Features
- Package Include:5 pcs.
- Materies: brass.
- Net Weight: 50g/pc.
- Type: Compression Union.
- Tube Size:1/2" OD.
Important Note
Pay attention to the column of size and color, you could find a variety of product types and quantities for your choice.
The more your purchase the best price you get.
About Shipping
Great stock availability and fast dispatch are our core business. We would make effort to process each order within 24 hours.
We are international seller, each item is required to be checked by two customs. China Post Air Mail and epacket are our main carriers,it normally takes about 1-2 weeks to deliver to US.
If you do not receive the item during this period or have any problems, kindly contact us firstly.
You can rest assured we would handle each order no matter big or small as faster as we can.
About Us
We are honest seller, any problems please contact us before leaving your feedback. We will try our best to work out the issue with you.
These products come from our joint factory, its annual output is about 100,000,000 pcs. It is one of the main copperware maker in China with a 25 years¡¯ experience in producing copperware and has already passed ISO 9001 quality guarantee system attestation, to ensure the long-term and stable quality of products .
- Type: Compression Union
- Tube Size:1/2" OD
- Materies: BRASS
- Net Weight: 50g/PC
- Choosing products dimensions and quantities at column of size and colour seperately,price would be more favorable if choosing wholesale.
User questions & answers
| Question: | Does it come with the olive |
| Answer: | It's a plug/gate valve. |
Metalwork Compression Union Brass Tube Fitting, 3/16" OD x 1/4" OD 2pcs
Metalwork
Product description
This compression union is made of brass, has compression connections, and is suitable for use with fuel and gas systems. It is made of brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability. This union connects two tubes in a straight run. It has a compression connection on both ends for connecting unthreaded tube. Tightening the nut against the sleeve creates a compression seal against leaks, and loosening the nut allows disassembly of the joined parts. This three-piece construction fitting – nut, sleeve, and body – can be used with copper, brass, aluminum, or plastic tubing and has an operating temperature range of -65 to +250 degrees F. This union compression tube fitting is suitable for use with fuel and gas systems, plumbing, refrigeration, and vacuum applications.
- Union for connecting and disconnecting two tubes more easily than with a coupling
- Compression tube connections on both ends
- Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability
- Three piece construction - nut, sleeve and body
- These fittings contain lead and are not allowed by federal law to be installed for potable water use in the U.S.A. and its territories.
4LIFETIMELINES Brass Compression Union, 5/16, 10/Bag
4LIFETIMELINES
- Our brake line unions are made with unmatched superior quality
- Made of durable brass which is resistant to corrosion from salt that can be used on roads in the winter
- Suitable for brake hydraulic line union
- Works with steel, copper nickel, copper coated steel, PVF-coated, and stainless steel lines
- Lifetime warranty included on all products purchased from 4Lifetimelines
User questions & answers
| Question: | Will these work with transmission lines |
| Answer: | yes |
| Question: | Will these work on steel fuel lines |
| Answer: | The thread is only applicable for tightening the compression nut. The actual pipe ends are not threaded and work through compression. |
| Question: | Do these unions have tube stops |
| Answer: | No flaring necessary |
| Question: | Thread pitch |
| Answer: | Don't see why not. These are compression fittings and I would bet they would work on nylon gas line. Give em a try. you won't be out much $ |
LTWFITTING 3/16-Inch OD Compression Union,Brass Compression Fitting(Pack of 10)
Ningbo Haishu HuaxinYicheng Trade Co., Ltd.
Product description
Product Description
Durable and high standard brass compression union. Commonly used to connect lines for air, water, fuel, oil and inert gases in a quick and simple way.
Click "honest-f" to choose the product you want in our shop.
Features
- Package Include:10 pcs.
- Materies: brass.
- Net Weight: 17.5g/pc.
- Type: Compression Union.
- Tube Size:3/16" OD.
Important Note
Pay attention to the column of size and color, you could find a variety of product types and quantities for your choice.
The more your purchase the best price you get.
About Shipping
Great stock availability and fast dispatch are our core business. We would make effort to process each order within 24 hours.
We are international seller, each item is required to be checked by two customs. China Post Air Mail and epacket are our main carriers,it normally takes about 1-2 weeks to deliver to US.
If you do not receive the item during this period or have any problems, kindly contact us firstly.
You can rest assured we would handle each order no matter big or small as faster as we can.
About Us
We are honest seller, any problems please contact us before leaving your feedback. We will try our best to work out the issue with you.
These products come from our joint factory, its annual output is about 100,000,000 pcs. It is one of the main copperware maker in China with a 25 years¡¯ experience in producing copperware and has already passed ISO 9001 quality guarantee system attestation, to ensure the long-term and stable quality of products .
User questions & answers
| Question: | Its rated for automotive brake lines |
| Answer: | No, The one I have is normally close. Until you put power to it then it open up. I use it for my transfer tank into the main tank. When drive down the road, just turn the switch solenoid valve opens, fuel runs in tank. Think about add a electric fuel pump to line for fasted delivery. |
Metalwork 304 Stainless Steel Compression Tube Fitting, Union, 3/8" Tubing OD (2 Pcs)
Product description
Pipe and tube fittings are components used for connecting, terminating, controlling flow, and changing the direction of piping in many different industries. Compression fittings do not require tools or sealants, and are useful in installations where a heat source, such as a soldering torch, is prohibited. When purchasing fittings, consider the application, as this will affect material type, shape, size, and required durability. Fittings are available threaded or unthreaded, in many shapes, styles, sizes, and schedules (pipe wall thickness).
- Union for connecting and disconnecting two pipes more easily than couplings
- Fitting connects to tubing on both ends
- Type 304 stainless steel for higher strength and greater corrosion resistance
- Operating temperatures: below 450℃/ Working pressure: 25Mpa-40Mpa
- Applicable medium: oil, water, gas and other non-corrosive or corrosive medium.
User questions & answers
| Question: | are these suitable for natural gas or LP lines |
| Answer: | Either blue or yellow will do |
Litorange 3 Pack Metals Brass Tube Fitting Fuel Brake Line Adapter Compression Union 3/8" x 3/8" Tube OD
Litorange
Product description
★ Material:
Heavy Duty Brass,strong and durable.
Operating temperatures range from -53 to 121 degrees C (-65 to 250 degrees F).
★ Specification:
1. Size: 3/8" x 3/8" Tube OD (Outer Diameter) Compression. 2. Easy to disassemble no flaring tool required.
3. This fitting is made of brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability.
4. Primary uses water, gasoline, oil and vacuum lines.
5. Pipe and tube fittings are components used for connecting, terminating, controlling flow, and changing the direction of piping in many different industries.
6. Compression fittings do not require tools or sealants.
7. When purchasing fittings, consider the application, as this will affect material type, shape, size, and required durability.
8. Tips: Nut, sleeve and body all included in package.
★ Package includes:
3 x 3/8" x 3/8" Tube OD Compression Connector with a plastic box .
- ★ 【Material】: Heavy Duty Brass,strong and durable. Dual couplings for joining two tubes of the same diameter(OD: Outer Diameter).
- ★ 【Firm And Durable】: Litorange Brass for corrosion resistance, high temperature ductility and low magnetic permeability.
- ★ 【Function】: Union for connecting and disconnecting two tubes more easily than with a coupling
- ★ 【Tips】: For low to medium pressure operating environments with no excessive vibration or tube movement. Use with copper, brass, aluminum, or plastic tubing
- ★ 【Package Include】: 3 PCS 3/8" x 3/8" Tube OD. (include nuts and ferrules)
User questions & answers
| Question: | Is this lead free |
| Answer: | Don't remember, but it works for my air suspension at 30 psi. |
| Question: | what is the thread pitch |
| Answer: | Probably not. You need to get a vacuum solenoid. |
| Question: | Description says "use with copper, brass, aluminum, or plastic tubing." is there a reason not to use it to join 3/8 steel to nicopp fuel lines |
| Answer: | I used m5 screws at 10mm and they work perfectly. |
LTWFITTING 5/16-Inch OD Compression Union,Brass Compression Fitting(Pack of 10)
Ningbo Haishu HuaxinYicheng Trade Co., Ltd.
Product description
Product Description
Durable and high standard brass compression union. Commonly used to connect lines for air, water, fuel, oil and inert gases in a quick and simple way.
Click "honest-f" to choose the product you want in our shop.
Features
- Package Include:10 pcs.
- Materies: brass.
- Net Weight: 29.3g/pc.
- Type: Compression Union.
- Tube Size:5/16" OD.
Important Note
Pay attention to the column of size and color, you could find a variety of product types and quantities for your choice.
The more your purchase the best price you get.
About Shipping
Great stock availability and fast dispatch are our core business. We would make effort to process each order within 24 hours.
We are international seller, each item is required to be checked by two customs. China Post Air Mail and epacket are our main carriers,it normally takes about 1-2 weeks to deliver to US.
If you do not receive the item during this period or have any problems, kindly contact us firstly.
You can rest assured we would handle each order no matter big or small as faster as we can.
About Us
We are honest seller, any problems please contact us before leaving your feedback. We will try our best to work out the issue with you.
These products come from our joint factory, its annual output is about 100,000,000 pcs. It is one of the main copperware maker in China with a 25 years¡¯ experience in producing copperware and has already passed ISO 9001 quality guarantee system attestation, to ensure the long-term and stable quality of products .
- Type: Compression Union
- Tube Size:5/16" OD
- Materies: BRASS
- Net Weight: 29.3g/PC
- Choosing products dimensions and quantities at column of size and colour seperately,price would be more favorable if choosing wholesale.
Boeray 5pcs Brass Tube Fitting, 3/8" to 3/8" Compression Union Fitting
Product description
Boeray 5pcs Brass Tube Fitting, 3/8" to 3/8" Compression Union Fitting
Material:CA 360 brass,high quality, provide high resistance to abrasion and corrosion.
Size: 3/8" to 3/8"
Union for connecting and disconnecting two tubes more easily than with a coupling
Temperature Range:-65 to +250 degrees F
Use with:copper, brass, aluminum, or plastic tubing.Primary uses water, gasoline, oil and vacuum lines. It is very convenient
These fittings contain lead and are not allowed by federal law to be installed for potable water use in the U.S.A. and its territories.
- Material:CA 360 brass,high quality, provide high resistance to abrasion and corrosion.
- Size: 3/8" x 3/8"
- Union for connecting and disconnecting two tubes more easily than with a coupling
- Temperature Range:-65 to +250 degrees F
- Use with:copper, brass, aluminum, or plastic tubing.Primary uses water, gasoline, oil and vacuum lines. It is very convenient
User questions & answers
| Question: | Does it really take a month for delivery of this item |
| Answer: | The fittings come with the ferrules |
Brass Compression Tube Fitting, Union Assortment Kits, 1/8" 3/16" 1/4" 5/16" 3/8" OD (5pcs)
Le
Product description
Used for a variety of applications, not limited to grease, fuels, refrigeration, water, oil gas, and hydraulic systems. If you are unsure as to which NPT thread size you have ,please reference this chart that show you the NPT thread size crossed over the your linear measurement in inches. Note:NPT cannot be accurately calvulated with a linear measuring tool like a Tape Measure, Ruler or Caliper. NPT Thread size is NOT determined by its outside thread diameter in inches.
- Contains: 1/8" OD x 1/8" OD-1pc; 3/16" OD x 3/16" OD-1pc; 1/4" OD x 1/4" OD-1pc; 5/16" OD x 5/16" OD-1pc; 3/8" OD x 3/8" OD-1pc; (5pcs)
- Three piece construction - nut, sleeve and body with attached insert.Easy to disassemble no flaring tool required.
- Use with copper, brass, aluminum, or plastic tubing. -65 Degree F to +250 degree F temperature range. Standard fittings use short nuts.
- Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability
- These fittings contain lead and are not allowed by federal law to be installed for potable water use in the U.S.A. and its territories.
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