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Selecting the right compression union fittings is crucial for ensuring secure and leak-free connections in your plumbing systems. These fittings are essential for joining pipes and offer a reliable solution for various applications, from DIY projects to professional installations. Investing in quality ensures durability and peace of mind.
STRAIGHT UNION KIT: The dot air compression union fittings kit package includes 53pcs : 4 pcs 1/8" x 1/8" compression tube union, 6 pcs 1/4" x 1/4" compression tube union,6 pcs 3/8" x 3/8" compression tube union,2 pcs 1/2" x 1/2" compression tube union...
PREMIUM MATERIAL: Our DOT dot air compression union fittings kit is made of high-quality CA360 brass, Meet D.O.T FMVSS 571.106, Air Brake system Requirements, with corrosion resistance, high-temperature ductility, and low permeability. Great for long-time...
PRESSURE RANGE: Air line fittings pressure resistance, not easy to trip. Air brake fittings working pressure from vacuum max to 300 PSI. Temperature Range: -65° F to +200° F(Note: see tubing manufacturer’s recommendations for pressure and temperature...
EASY TO INSTALL: Our dot air compression union fittings kit quicks disconnect push tubing in, you need to use tools to fix loose parts to handle in tight places so that use will be firmer and not easy to fall off. And wrapped the additional teflon tape we...
TYPICAL APPLICATION: Air brake fittings assortment kit can be used with air systems, copper tubing in airline brake systems, which is perfect for automotive car or truck repair, air operated seats, operating gauges, air horns, industrial workshops, air...
PREMIUM MATERIAL: Our brass compression fittings kit is made of high-quality brass, with strong wear, corrosion resistance, high compressive strength, durability, low magnetic permeability and high temperature ductility
WORKING PRESSURE & TEMPERATURE: The maximum working pressure of compression tube fitting repair is up to 200PSI , temperature range -65°F to +250°F (-53°C to +121°C)
EASY TO INSTALL: Manufactured for low and medium-pressure tubing connection work where excessive vibration or tube movement is not involved. Compression Fittings do not require any flaring, soldering, or other type of tubing preparation. Use with copper...
WIDELY USE: Brass compression tube fittings meet specifications and standards of ASA, ASME and SAE. Good sealing and repeatability, temperature and pressure resistance. Perfect fit for oil, gas, water and other non-corrosive or corrosive pipeline systems...
Union for connecting and disconnecting two pipes more easily than couplings.
“OD” is the size of the tube you will connect, not the size of the female compression.
Type 304 stainless steel for higher strength and greater corrosion resistance; Operating temperatures: below 450℃/ Working pressure: 25Mpa-40Mpa
Only be used for connecting hard tube, such as steel tube, copper tube, etc. If you want to connect hoses, please use it with a compression insert bush. Otherwise, it may cause leakage.
Please ensure the cut of the connecting tube is flat, otherwise it may also cause leakage.
SIZE - 1/4" Tube OD x 1/4" Tube OD, Compression Tube Fitting mainly consists of a fitting body with a 24 degree tapered hole, a ferrule with a sharp inner edge, and a nut for compression.
MATERIAL - Made of high-quality brass, with strong wear and corrosion resistance, high compressive strength, durability, low magnetic permeability and high temperature ductility.
USE - Suitable for oil, gas, water and other non-corrosive pipeline systems, temperature and pressure resistance, good sealing and repeatability, no need for welding and flaring tools, easy disassembly, installation and maintenance, etc.
WORKING PRESSURE & TEMPERATURE - 1200PSI maximum working pressure, temperature range -65°F to +250°F (-53°C to +121°C)
WORKING PRINCIPLE - Compression Tube Fitting is to compress the ferrule by thread interlocking, and the two ends of the inner diameter of the ferrule tightly wrap the tube due to radial shrinkage, which plays a sealing role and realizes the sealing and...
Premium Quality: Aienxn compression fittings are made of solid , high quality and brass construction
Package Include: 4pcs 1/8", 5pcs 3/16", 5pcs 1/4", 2pcs 5/16", 2pcs 3/8"; Total 18pcs in a box
Wide Application: The compression fitting is suitable for oil, gas, water and other non-corrosive or corrosive pipeline systems, without welding and flaring tools, easy to disassemble, install and maintain
Features: Aienxn compression fittings have corrosion resistance, ductility at high temperatures and low magnetic permeability
Timely Reply: If you have any questions, please email us and we will reply you within 24 hours
【You Will Get】- 10 pcs 1/2" OD x 1/2" OD compression union fittings, 10 pcs 1/2" OD Brass Compression Sleeves Ferrules. Compression Tube Fitting mainly consists of a fitting body with a 24 degree tapered hole, a ferrule with a sharp inner edge, and a...
【High Quality Brass】 - Our 1/2" compression fitting is made of high-quality brass, with strong wear，corrosion resistance, high compressive strength, durability, low magnetic permeability and high temperature ductility
【Widely Use】- 1/2 inch compression fitting meets specifications and standards of ASA, ASME asn SAE. Good sealing and repeatability, temperature and pressure resistance. Perfect fit for oil, gas, water and other non-corrosive or corrosive pipeline...
【Working Pressure & Temperature】- 2000 PSI maximum working pressure, temperature range -65°F to +250°F (-53°C to +121°C)
【Tips】- These 1/2 brass compression fitting 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: Crafted from robust brass, offering exceptional wear and corrosion resistance; engineered for long-lasting durability and performance.
Application: Suitable for use in various pipeline systems including oil, gas, water, and other non-corrosive or corrosive environments; not for potable water use.
Pressure and Temperature Rating: Capable of withstanding a maximum working pressure of 2000 PSI and a temperature range from -65°F to +250°F (-53°C to +121°C).
Easy Installation: No welding or flaring tools required for installation, disassembly, or maintenance.
Comprehensive Kit: Includes 46 pieces of assorted compression couplings and sleeves ferrules in various sizes.
Size: 3/8 inch OD copper tube connector is suitable for rigid pipes such as copper and aluminum pipes and is suitable for rigid pipes with a 3/8 inch OD; not suitable for hoses
Package Contents: there are 4 pieces copper tube connectors, the quantity is sufficient to meet your home usage and replacement needs, you can also share them with your neighbors or relatives
Tear and Wear Resistant: made of quality brass material, these line pressure fittings are reliable and sturdy, will not easy to break, tear and wear resistant, which can serve you for a long time
Wide Range of Applications: these brass compression tube fittings are suitable for many occasions, they are practical and helpful home tools, bring much more convenience to your daily life
Compact and Lightweight: the copper union fitting measures approx. 4 x 1.82 x 1.6 cm/ 1.57 x 0.72 x 0.63 inches, compact and lightweight, easy to store without taking up too much space
QUICK INLINE REPAIR — NO FLARING OR WELDING: The 3/16" compression union joins two tube sections with a mechanical seal using a precision compression sleeve. No flare tools, no torch, no special equipment — just tighten the nuts for a secure...
RATED UP TO 5,000 PSI: Built for high-pressure applications when installed to spec. Suitable for brake lines, fuel lines, transmission lines, and other demanding tubing systems where a reliable, high-pressure seal is critical.
BLACK-OXIDE COATED STEEL CONSTRUCTION: The black-oxide finish provides a layer of corrosion and rust resistance, extending the life of the fitting in harsh, moisture-prone, and road-salt environments. Durable enough for underbody and engine bay...
WORKS WITH COMMON 3/16" TUBING: Compatible with 3/16" OD brake line tubing including stainless steel, copper-nickel, and standard steel. A versatile connector for splicing new tubing to existing lines, extending runs, or repairing damaged sections without...
SHOP-READY PACKAGING — 1 PER BAG: Ships individually bagged for easy inventory control. Available as a single unit or a 2-pack. Clean, organized packaging for service trucks, shop shelves, or parts bins.
BUILT TO LAST — STEEL CORE DURABILITY: The galvanized steel body provides structural strength that won't fatigue or weaken over time under vibration, pressure cycling, or temperature swings. A permanent repair solution, not a temporary fix.
Last update on 2026-07-17 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Compression Union Fittings
Material Composition
When choosing a compression union fitting, the material is a primary consideration. Common options include brass, stainless steel, and plastic. Brass offers good corrosion resistance and is suitable for water and various gases. Stainless steel provides superior strength and excellent resistance to corrosion, making it ideal for harsher environments or high-pressure applications. Plastic fittings are lightweight, cost-effective, and resistant to certain chemicals, but may not be suitable for high temperatures or pressures.
Size and Compatibility
Ensure the fitting's size matches the outer diameter of the pipes you intend to connect. Compression fittings are designed for specific pipe sizes, and using the wrong size will result in leaks. Always verify the compatibility of the fitting with the type of pipe material (e.g., copper, PEX, PVC) and the intended fluid or gas.
Pressure and Temperature Ratings
Check the maximum pressure and temperature ratings of the fitting. These specifications are critical for safety and performance. Select a fitting that can comfortably exceed the expected operating pressure and temperature of your system to prevent failure and ensure longevity.
Frequently Asked Questions
What is a compression union fitting?
A compression union fitting is a type of pipe fitting used to connect two pipes of the same size. It works by using a compression nut and a ferrule that compresses onto the pipe when the nut is tightened, creating a watertight seal without the need for soldering or adhesives.
Are compression fittings suitable for high-pressure systems?
Yes, many compression fittings are designed for high-pressure applications. However, it's essential to check the specific pressure rating of the fitting and ensure it meets or exceeds the requirements of your system. Materials like stainless steel often offer higher pressure capabilities.
Can I use compression fittings outdoors?
The suitability of compression fittings for outdoor use depends on the material and the environment. Brass and stainless steel fittings generally offer good resistance to outdoor conditions and corrosion. Plastic fittings may degrade over time when exposed to UV light and extreme temperatures.
How do I install a compression union fitting?
Installation typically involves sliding the compression nut and ferrule onto one of the pipes. Then, insert the second pipe into the fitting and slide the ferrule and nut into place. Tighten the nut firmly with a wrench to create the seal; avoid over-tightening, which can damage the fitting or pipe.
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