14 best compression fittings

Compression fittings are widely used in various industries, including plumbing, hydraulics, and pneumatics, to create secure and leak-proof connections between pipes or tubing. Here's what you need to know about compression fittings:

  1. Purpose: Compression fittings are used to join two pieces of tubing or pipe together or to connect tubing to a fixture, valve, or other components in a fluid or gas system. They are designed to provide a tight and reliable seal without the need for soldering, welding, or threading.

  2. Components: A typical compression fitting consists of several components:

    • Compression nut: This is a threaded nut that tightens down onto the fitting body.
    • Fitting body: The body is a cylindrical or conical component that houses a ferrule or compression ring.
    • Ferrule (compression ring): The ferrule is a ring made of soft metal or plastic that compresses when the nut is tightened, creating a seal between the tubing and the fitting body.
  3. Working Principle: When the compression nut is tightened onto the fitting body, it compresses the ferrule onto the tubing. This compression creates a secure and leak-free connection. The ferrule deforms and conforms tightly around the tubing, preventing fluid or gas from escaping.

  4. Materials: Compression fittings are available in a variety of materials, including brass, stainless steel, and plastic. The choice of material depends on the specific application and the compatibility with the fluid or gas being transported.

  5. Types: There are different types of compression fittings, including straight couplings, elbows, tees, and adapters, to accommodate various plumbing or piping configurations.

  6. Applications: Compression fittings are commonly used in plumbing systems for water supply lines, gas lines, and air compression systems. They are also prevalent in hydraulic and pneumatic systems where a reliable seal is crucial.

  7. Installation: Installing compression fittings requires cutting the tubing or pipe to the desired length, inserting the ferrule onto the tubing, and then attaching the fitting body. The compression nut is tightened onto the fitting body using a wrench or other appropriate tools to create the seal.

  8. Advantages:

    • No soldering or welding is required, making installation easier.
    • They can be disassembled and reused if needed.
    • Compression fittings provide a secure and reliable seal.
  9. Limitations:

    • They may not be suitable for high-pressure or high-temperature applications, as the soft metal or plastic ferrule can deform over time.
    • Proper installation is crucial to prevent leaks, so following manufacturer guidelines is essential.

In summary, compression fittings are essential components in various industries for creating leak-proof connections between pipes or tubing. They offer a convenient and reliable method for joining fluid or gas-carrying components without the need for soldering or welding.

Below you can find our editor's choice of the best compression fittings on the market
  

Ruikarhop 150PCS Tube OD(1/4" 3/8" 1/2") Brass Compression Sleeves Ferrules,Brass Compression Fitting Assortment Kit

Ruikarhop

Based on 159 reviews Check latest price

Product description

Ruikarhop Brass Compression Sleeves Ferrules With Good quality,

Durable and high standard brass compression Sleeves,

Please feel free to contatct us if you have any questions about our product.

  • Suitable for the outer diameter of the pipe:1/4" 3/8" 1/2"
  • Product Material: Brass.
  • Used with plastic and copper tubing.
  • Package Include:150PCS Compression Sleeve Ferrules.
  • Commonly used to connect lines for air,water,fuel,oil and inert gases in a quick and simple way.

Corsair Hydro X Series Xf Compression 10/13mm (3/8"/ 1/2") ID/OD Fittings Four Pack, Black, Model Number: CX-9051002-WW

Corsair

Based on 254 reviews Check latest price

Product description

Corsair Hydro x series XF compression fittings are the perfect fit for your soft tubing custom cooling system, Machined from solid brass and clad in a range of durable finishes. Compatible with 10/13mm (3/8"/ 1/2") ID/OD soft tubing and equipped with a ultra-tight compression compression fitting to securely seal your loop. Tech Support # 1-888-222-4346 opt #1

  • Dual 140mm fan mounts on either side of the radiator are ready for your most ambitious custom Liquid Cooling build.
  • 30mm radiator thickness delivers extreme cooling performance with high-airflow and low-noise fans.
  • A premium COPPER radiator core and 25 micron thick cooling fins provide a high thermal transfer rate optimized for CORSAIR's performance copper water blocks.
  • High-quality matte Black polyurethane coating delivers a flawless finish to match your system.
  • Integrated fan screw guides make it easy to install fans even when the radiator is fitted into a case.

User questions & answers

Question: What this item made of?(material
Answer: Hi, Yes, port thread is G1/4″ BSPP If you have any other questions please reach out: support.corsair.com
Question: What kind of tool would you recommend to tigten it down? Or just hand tight
Answer: Hi, These fittings are compatible with the soft tubes that match the specified size for this fitting. For these fittings, soft tubing should match the following specification: ID (inner diameter) of 10mm or 3/8'' OD (outer diameter) of 13mm or 1/2'' If you have any other questions please reach out: support.corsair.com
Question: Is this G
Answer: If working properly the safety will blow at 200, if the safety valve psi is lower than the pressure switch set point it will blow before it reaches the set point, so the comp will never shut off, the safety valve should be about 30 lbs more than the pressure switch set point. A 200 psi safety switch is common on a comp set to 165-175 psi.
Question: Will these fit ekwb ek-tube zero maintenance soft tubing
Answer: Its' purpose is to relieve pressure - that's what it's designed for.I would not use it to drain water from a tank; it would likely corrode the components and compromise its' effectiveness.You will never find one of these on a compressor at the bottom of the tank - there's a drain there; it's always placed toward the top away from water build up.

LTWFITTING 1/4-Inch OD Compression Union,Brass Compression Fitting(Pack of 10)

Ningbo Haishu HuaxinYicheng Trade Co., Ltd.

Based on 104 reviews Check latest price

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.

SDTC Tech 4-Pack G1/4" to 3/8" ID 5/8 OD Quick Tighten Compression Fitting for Soft Tubing, PC Water Cooling System Soft Tube Connectors

Based on 4 reviews Check latest price

Product description

Features:

1. Embedded O ring design, which can prevent leakage effectively.

2. Made of brass to ensure a long lifespan for the part, and with easy tool-free installation.



Specifications:

Name: G1/4" to 3/8" Soft Tubing Connector

Fit: Compatible with 10mm * 16mm (ID*OD) soft tube

Material: Brass

Color: Black

Thread: G1/4", 5mm length



Package Include:

4 pcs G1/4" to 3/8" * 5/8" (ID*OD) PC Water Cooling System Tube Fitting

  • G1/4 PC Water Cooling System Soft Tubing Fitting, quick and easy to tighten, with embedded O ring design for leakproof seal.
  • Suit for 3/8" ID 5/8" OD Tubing, compatible with 10mm * 16mm (ID*OD) soft tube.
  • Made of high quality brass, black chrome finish, rust resistant and durable.
  • The Soft Tube Connector equipped with a ultra-tight compression fitting to securely seal your water cooling loop.
  • Package includes 4pcs G1/4" Male Thread to 3/8" * 5/8" (ID*OD) Soft Tubing Quick Fitting.

Horiznext Stainless Steel Compression Fitting, 1/2" Tube OD x 1/2 NPT Male Coupler ss tubing Adapter

Horiznext

Based on 41 reviews Check latest price
  • Coupler connects to tubing on one end and has an NPT male thread connector on the other.
  • 1/2" outer diameter tube,1/2" NPT male thread.
  • Made of stainless steel 304, heavy duty, durable and corrosion resistance.
  • Maximum working pressure of 2000 psi.
  • Temperature range from -212 to +1472 degrees ℉

User questions & answers

Question: Where could I find installation instructions? This unit has 2 internal components, but the compression adapters I have used in the past only had one
Answer: On the compression side, 1/2’’ O.D. or 3/8” O.D. Stainless steel tube . The threaded NPT side, 1/4”, 3/8” or 1/2” stainless steel NPT threaded pipe and or fittings.
Question: Will 1/2 Tubing pass fully through this fitting or is there a ridge inside stopping the tubing? I wish to use this to hold tubing at different heights
Answer: It works for not only copper tubing, but also other metal tubing.
Question: what size stainless steel pipe do I need to fit this connector
Answer: Hi Jex, Fittings are machined from solid brass and clad in a range of durable finishes. If you have any other questions please reach out: support.corsair.com
Question: will this work for copper tubing also
Answer: I've always just hand tightened without an issue

Product features

What it is like ?

This fitting is made of 304 stainless steel for higher strength and great corrosion resistance. This fitting has hex nut construction for tighter, leak-free connections. It is compatible with stainless steel, copper, rigid and semi-rigid plastic tubing, but is not recommended for soft tubing. It is suitable for use in chemical, petroleum, power generation, laboratory, and medical device plants.

Our technical specification

Material: stainless steel 304

Size: 3/8" , 1/2", NPT1/4-1/2"

Maximum working pressure:20000 psi

Working Temperature: -212 to +1472 degrees ℉

Horiznext Stainless Steel Compression Tube Fitting, Union, 1/4" Tube OD. Straight Adapter

Horiznext

Based on 75 reviews Check latest price
  • Made of stainless steel 304, heavy duty, durable and corrosion resistant.
  • 1/4" outer diameter tube
  • Fittings for connecting and extending stainless steel, copper, rigid and semi-rigid plastic tubing
  • Maximum working pressure of 2000 psi
  • Temperature range from -212 to +1472 degrees ℉

Product features

What it is like ?

This fitting is made of 304 stainless steel for higher strength and great corrosion resistance. This fitting has hex nut construction for tighter, leak-free connections. It is compatible with stainless steel, copper, rigid and semi-rigid plastic tubing, but is not recommended for soft tubing. It is suitable for use in chemical, petroleum, power generation, laboratory, and medical device plants.

Our technical specification

Material: stainless steel 304

Size: 3/8" , 1/2"

Length: 1.85 inches, 1.77 inches.

Maximum working pressure:2000 psi

Working Temperature: -100 to +660 degrees ℉

4LIFETIMELINES Brass compression union, 3/16, 10/bag

4LifetimeLines

Based on 131 reviews Check latest price

Product description

NOT for use in Automotive Brake Lines

  • 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
  • Suitable for brake hydraulic line union
  • Lifetime warranty included on all products purchased from 4Lifetimelines

User questions & answers

Question: If im using your 25 ft 3/16 brake line can i use these fittings without flaring the tubing
Answer: yes I recomend this compressor fitting for brake line
Question: will they work to connect fuel line nylon to nylon
Answer: Hi, pls email me for a picture of installation since only word typing can be uploaded here. You can also find the installing instruction on our listing detail page.
Question: Can this be use for brake line
Answer: there are two small parts in the fitting. pls see the description.

Barrow G1/4" to 3/8" ID, 5/8" OD Compression Fitting for Soft Tubing, Black, 4-Pack

Barrow

Based on 52 reviews Check latest price

Product description

The Barrow Compression Fitting is designed for 3/8" Inner diameter 5/8" outer diameter tubing. The product matching series are designed to look elegant in every system, highlighting the individual design of the computer. With a new process during chromatizing the surface finish is completely connected with the brass body, hence ensuring permanent intense colors and peeling of the chrome layer.

Model: TR-THKN-3/8-V3-4P

  • Fitting for PC water cooling application
  • Compression fitting
  • High Quality Nickel-plated Brass
  • Thread: G1/4"
  • Color: Black

Ruikarhop 150PCS Tube OD(3/16" 1/4" 5/16") Brass Compression Sleeves Ferrules,Brass Compression Fitting Assortment Kit

Based on 6 reviews Check latest price

Product description

Ruikarhop Brass Compression Sleeves Ferrules With Good quality,

Durable and high standard brass compression Sleeves,

Please feel free to contatct us if you have any questions about our product.

  • Suitable for the outer diameter of the pipe:3/16" 1/4" 5/16"
  • Product Material: Brass.
  • Used with plastic and copper tubing.
  • Package Include:150PCS Compression Sleeve Ferrules.
  • Commonly used to connect lines for air,water,fuel,oil and inert gases in a quick and simple way.

4LIFETIMELINES Brass Compression Union, 5/16, 10/Bag

4LIFETIMELINES

Based on 61 reviews Check latest price
  • 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 $

Litorange 4 Pack Metal Brass Compression Tube Pipe Fitting Connector, Straight Coupling Adapter, 1/4" Tube OD x 1/4" NPT Male

Litorange

Based on 69 reviews Check latest price

Product description

★ Material:



Heavy Duty Brass,strong and durable.

Meets ASTM B584 standards for quality assurance and ASME/ASMI B16 technical specifications.

Operating temperatures range from -53 to 121 degrees C (-65 to 250 degrees F).





★ Specification:



1. Litorange tube fitting is made of brass, and connects tubing to threaded pipe conforming to the National Pipe Thread (NPT) standard in a straight run.

2. A single ferrule compression fitting connects to tubing on one end for a leak-resistant seal in high-pressure, high-vacuum, and high-vibration applications, and a male NPT connector on the other end connects to threaded pipe.

3. Single ferrule compression fittings have fewer possible leak paths than twin ferrule fittings. This fitting is made of brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability.

4. It is commonly used in chemical, petroleum, power generation, laboratory, and medical device plants.

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, and are useful in installations where a heat source, such as a soldering torch, is prohibited.

7. When purchasing fittings, consider the application, as this will affect material type, shape, size, and required durability.

8. Tips: For better sealing, we suggest that all fittings must be used with teflon tape.





★ Package includes:



4 x 1/4" Tube OD x 1/4" NPT Male connector

  • ★ 【Material】: Heavy Duty Brass,strong and durable. Size: 1/4" Tube OD x 1/4" inch NPT Male Adapter.
  • ★ 【Firm And Durable】: Litorange Brass for corrosion resistance, high temperature ductility and low magnetic permeability.
  • ★ 【Function】: Fitting connects to tubing on one end and has an NPT male connector on the other. Use with copper, brass, aluminum, or plastic tubing.
  • ★ 【Tips】: Single ferrule compression fitting has fewer possible leak paths than twin ferrule fittings. Primary uses water, gasoline, oil and vacuum lines.
  • ★ 【Package Include】: 4 PCS 1/4" Tube OD x 1/4" NPT Male connector. Comes with 1 year warranty.

User questions & answers

Question: Lead free
Answer: I have used them on evap lines long term and on 50 psi mpi fuel lines as trail repairs on offroad vechiles to get someone one without issue.

PC Water Cooling Brass Tube Fitting Water Cooling Compression Fitting Suitable for 16mm Outer Diameter Rigid Tube(4pcs White)

Based on 12 reviews Check latest price

Product description

Features:

1. Suitable for 16mm outer diameter rigid tube (Including plastic material and metal material tubes).

2. Three-layer sealing rings, good sealing performance, eliminating leakage risks.

3. High quality brass materials, durable for long term use.

4. Fine workmanship, has passed EU ROHS certification.

5. A variety of colors can be chosen for your different needs.



Specifications:

Suitable: for 16mm Outer Diameter Rigid Tube

Model: YGKN-C16MM

Material: Brass

Options: 4pcs Red, 4pcs Blue, 4pcs Green, 4pcs White, 4pcs Black, 4pcs Silver, 6pcs(Red+Blue+Green+White+Black+Silver) 

Inner Diameter: Approx. 17mm / 0.67in

Weight: 77-160g



Package List:

4 or 6 x Water Cooling Tube Fittings

8 or 12 x Sealing Rings

  • Suitable for 16mm outer diameter rigid tube (Including plastic material and metal material tubes)
  • Three-layer sealing rings, good sealing performance, eliminating leakage risks
  • High quality brass materials, durable for long term use
  • Fine workmanship, has passed EU ROHS certification
  • A variety of colors can be chosen for your different needs

Thermaltake Pacific Black 4 Build-in O-Rings C-Pro G1/4 PETG 16mm OD Compression Fitting 6 Pack CL-W214-CU00BL-B

Thermaltake

Based on 354 reviews Check latest price

Product description

The Pacific C-Pro Series is a revolution in fitment design. It simplifies the process of setting up a custom liquid-cooling loop and provides a seal that outperforms traditional compression fittings. By using 4 preinstalled O-rings and an overhauled design, the C-Pro Series is the new standard in fitment technology and it is exclusive to Thermaltake.

P/N: CL-W214-CU00BL-B

Model: Pacific C-Pro G1/4 PETG 16mm OD 6 Pack - Black

Dimension: D26 x 21 (H) (mm)

Applicable: OD : 16 mm

Weight : 320 g

Material: CU + AL

Screw Thread: G 1/4

Note: PETG Tube to G1/4

  • Fitment Reimagined: This new concept makes it easier than ever to install custom hard tube liquid cooling loops
  • Four Built in O rings: Maximum leak prevention, secure compression seal, and peace of mind
  • Protection You Expect: Surface treated and a special coating finish provides increased durability and protection from corrosion
  • Build It Your Way: Compatible with liquid cooling components that utilize G1/4 thread ports and 16mm OD PETG, Acrylic, and Copper hard tubing
  • Exclusively Designed Open End Wrench is Included

User questions & answers

Question: are these fine with other copper fittings,blocks,rad,etc
Answer: This white C-Pro fitting is made of copper.
Question: Can i use this fitting for bitspower 16mm petg tube
Answer: The C-Pro is made of copper
Question: What type of metal are they made of
Answer: No brass in the world is 100% lead-free. This brass has so little lead that nobody will ever experience any health effect.
Question: What are the C-Pro fittings made from? Are they compatible with nickel plated water blocks
Answer: As long as your lines are 5/16.

Product features

Thermaltake Pacific C-PRO G1/4 PETG Tube 16mm OD Compression

The Pacific C-Pro Series is a revolution in fitment design. It simplifies the process of setting up a liquid-cooling loop and provides a seal that outperforms traditional compression fittings. By using 4 preinstalled O-rings and an overhauled design, the C-Pro Series is the new standard in fitment technology and it is exclusive to Thermaltake.

High-Flow and Leak-Free Structure

Custom made for simplify the installation of PETG tubing, designed to work in tight spaces without compromising the compression seal or impacting the flow of coolant, the C-Pro range features four rubber O-rings instead of the traditional two, creating a more secure seal and more reliable performance.

For Tubes: Outer Diameter: 16mm.

Exclusively Designed Open-End Wrench

The wrench with double-ended design is specially crafted for Thermaltake Pacific Series fittings. The smaller end is used to grip the C-Pro Series compression fittings, providing an easier and faster way to turn the fitting.

Only 6 Fitting Pack includes the 'Open-End' Wrench. Single Pack does not include the 'Open-End' Wrench.

Easy Installation, Game-Changing Design

By rethinking the traditional compression fitting design, this new concept makes it easier than ever to install custom liquid-cooling loops.

Installation Guide

Step 1. Slide the compression nut over the tube.

Step 2. Install the o-ring.

Step 3. Install the packing.

Step 4. Install the fitting base on your components.

Step 5. Tighten the compression nut.

Caution: The O-ring and the packing with a groove on the inside diameter must always be installed towards the top of the compression nut.

SUNGATOR 12-Pack Air Hose Fittings, 1/4" Barb x 1/4" NPT Male Pipe, Brass Hose Barb Fittings, Adapter, Compression Hose Fittings

SUNGATOR

Based on 350 reviews Check latest price

Product description

SUNGATOR is committed to bringing cost-effective products to customers, so that customers get more than they pay, high quality products to our own requirements, customer satisfaction is our pursuit!



High quality: Premium solid brass with a longer service life for corrosion resistance, high strength, high hardness, thick wall, more durable than iron and iron galvanized pipe fittings, not a cast product.



Excellent performance: Precisely milled, threads are tighter and deeper, not easy to slip, smooth threads will reduce the resistance during installation, saving time and improving efficiency.



Tips: For better sealing, we suggest that all fittings must be used with sealing tape.

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.



Contents: 12 pack of 1/4”barb X 1/4”NPT male pipe.

  • 【PREMIUM MATERIAL】: SUNGATOR selects high quality solid brass, firm and durable, brass is corrosion resistant and can be used in wet environments, 1/4”barb X 1/4”NPT male pipe, 12 pack
  • 【DURABLE】: The barb fitting is not a cast product and has a longer service life than iron and iron galvanized pipe fittings
  • 【SUPERIOR THREADS】: Barbed edges provide excellent connection, deeper and smoother threads design makes work easier and more effective
  • 【FUNCTION】: A barb (or hose barb), which connects flexible hose or tubing to pipes, one side is used to connect hoses while the other side is used to connect to NPT pipes, especially for small rubber hoses and plastic hoses as well as air tools
  • 【OPERATING TEMPERATURES】: Solid brass can withstand up to 100 °C (212 °F)

User questions & answers

Question: How are these 1/4" npt? i just received these and the threaded portion is about 0.53" od. not a problem for my application but i'd like to know
Answer: .283”
Question: will this work for 1/4" hose
Answer: Should work perfectly fine with any metal
Question: Internal diameters
Answer: Yes. But i haven’t done that. I have used this Thermaltake Pacific DIY LCS 1000mm Lengths V-Tubler PETG Hard Tubing (4-Pack) OD 16mm (5/8") x ID 12mm (1/2") CL-W116-PL16TR-A Keep in mind OD means outer diameter

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