Best Tube Fitting Unions of 2026

Tom Law Avatar
Tom Law
Last Updated: 2 Feb 2026

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Tube fitting unions are essential components in many industrial applications, allowing for the safe and efficient connection of tubing systems. These unions come in a variety of sizes and materials, including stainless steel and brass, and are designed to provide leak-free connections that can withstand high pressure and temperature conditions. They are commonly used in industries such as oil and gas, chemical processing, and manufacturing. With their reliable performance and ease of installation, tube fitting unions are a valuable addition to any tubing system.

At a Glance: Our Top Picks

sourcing map Quick Connect Bulkhead Unions Cover #TOP 1
sourcing map Quick Connect Bulkhead Unions
ftb score rating icon 9.8
Fafeicy Plastic Hose Barb Fitting, Union Adapter Connector for Pump Tube, Silicone Tube Connection, 9mm Straight Through, 10 Pieces Cover #TOP 2
Fafeicy Plastic Hose Barb Fitting, Union Adapter Connector for Pump Tube, Silicone Tube Connection, 9mm Straight Through, 10 Pieces
ftb score rating icon 9.7
Straight Push Connectors,4mm OD,Plastic Straight Union,Push to Connect Tube Fitting,Push Fit Lock,Blue,8pcs Cover #TOP 3
Straight Push Connectors,4mm OD,Plastic Straight Union,Push to Connect Tube Fitting,Push Fit Lock,Blue,8pcs
ftb score rating icon 9.5

Top 10 Tube Fitting Unions

#TOP 1

sourcing map Quick Connect Bulkhead Unions

MPM-6
Black,silver
sourcing map Quick Connect Bulkhead Unions Cover
sourcing map Straight Pneumatic Push to Quick Connect Fittings Bulkhead Union 6mm Tube OD X 6mm Tube OD 2pcs

The sourcing map Quick Connects are designed for seamless tube connections with a size of 6mm OD on both ends. They can operate under pressures of 0-0.9MPa and within a temperature range of 0 to 60 degrees Celsius, ensuring durability in various conditions. Their push-to-connect feature allows for quick and easy installation, making your projects more efficient. With excellent abrasion resistance and a robust release cap, these fittings can handle greater pressure without risk of failure, providing you with peace of mind during use.

What We Like
Easy installation
Durable and lightweight
Good sealing performance
Pressure and temperature resistant
Corrosion resistant
#TOP 2

Fafeicy Plastic Hose Barb Fitting, Union Adapter Connector for Pump Tube, Silicone Tube Connection, 9mm Straight Through, 10 Pieces

Fafeicyb18kaiegqv-12
Default
Fafeicy Plastic Hose Barb Fitting, Union Adapter Connector for Pump Tube, Silicone Tube Connection, 9mm Straight Through, 10 Pieces Cover
Fafeicy Plastic Hose Barb Fitting, Union Adapter Connector for Pump Tube, Silicone Tube Connection, 9mm Straight Through, 10 Pieces

Features
Smooth Inner Wall: The Inner Wall Of The Straight-Through Joint Is Smooth And Flat, Minimizing Fluid Resistance And Residue.
Multifunctional Connection: This Product Is Suitable For Hose Connection And Can Effectively Support Pump And Silicone Tubes To Meet Various Pumping And Transmission Needs.
Use: Plastic Barb Joint Is Suitable For Pharmaceutical, Food And Beverage, Laboratory, Many Industries, Strong Adaptability, To Meet The Needs Of Different Fields Of Fluid Transmission.
Material: Plastic Hose Barb Joints Are Made Of PE Material To Ensure The Fluid Is Pure And Safe, And Are Suitable For Homes And Sensitive Industrial Environments.
10 Pieces In A Set: 10 Pieces In A Value-For-Money Package To Meet Multiple Installation, Repair Or Spare Needs.
#TOP 3

Straight Push Connectors,4mm OD,Plastic Straight Union,Push to Connect Tube Fitting,Push Fit Lock,Blue,8pcs

CSY10001
Straight Push Connectors,4mm OD,Plastic Straight Union,Push to Connect Tube Fitting,Push Fit Lock,Blue,8pcs Cover
Straight Push Connectors,4mm OD,Plastic Straight Union,Push to Connect Tube Fitting,Push Fit Lock,Blue,8pcs

Features
The Push-To-Connect End Can Be Rotated 360 Degrees Even After Installation, Which Is Convenient To Use And Has Good Sealing Performance.
Pack Of 8pcs 4mm OD Plastic Straight Tube Fitting Union Push To Connect 4mm
Push To Connect Fittings Designed For Using To Connect With Polyethylene, Nylon And PU Tubing.union Push To Connect 4mm
Note: Make Sure That The Cutting Surface Of The Pipe Is Vertical. Please Insert The Tube Into The Bottom Before Use.
Mainly Used For Air Compression Systems, Vacuum Systems, Pneumatic Systems.
#TOP 4

ERGAOBOY 5Pcs Brass Compression Tube Fitting, 8MM OD X 8MM OD Female Compression Union Straight Connector

‎PA-254
Gold
ERGAOBOY 5Pcs Brass Compression Tube Fitting, 8MM OD X 8MM OD Female Compression Union Straight Connector Cover
ERGAOBOY 5Pcs Brass Compression Tube Fitting, 8MM OD X 8MM OD Female Compression Union Straight Connector

Features
Product Name: Brass Female Compression Tube Fittings, The Compression Tube Fitting Employs Threaded Interlocking Compression Sleeves. The Inner Diameters At Both Ends Of The Sleeves Radially Contract To Tightly Envelop The Pipe Body, Achieving A Secure Connection And Providing A Tight Seal Between The Fitting And The Pipe. This Design Offers Excellent Sealing Performance.
Size: 8MM Tube OD X 8MM Tube OD Fittings
Working Pressure And Temperature Range: 0-1MPa And -50-120°C
Widely Used: Suitable For For Fuel/Air/Liquid/Oil/Gas/Vacuum Lines, Not For Use In Potable Water.
Material: Made Of High Quality Brass With Abrasion Resistance, Corrosion Resistance, High Compressive Strength, High Temperature Ductility, And Low Magnetic Permeability
#TOP 5

Metalwork 5mm Straight Pneumatic Connector Pack

Metalwork
PU-Kit1
Metric Tube
5mm x 5mm
Metalwork 5mm Straight Pneumatic Connector Pack Cover
Metalwork Plastic Push to Connect Straight Union Pipe Tube Fitting, 5mm OD x 5mm OD, Straight Pneumatic Connector (Pack of 10)

The Metalwork Pneumatic Connector is designed for quick and reliable connections with 5mm outer diameter polyurethane or nylon tubing. Its straight union, same diameter configuration allows for easy assembly and continuous use, making it ideal for various applications. You will appreciate its reusable feature, enabling multiple connections and disconnections without losing functionality. Additionally, the convenient elliptical sleeve configuration ensures a secure fit, providing peace of mind while operating under pressures of up to 150 PSI.

What We Like
Quick and reliable connections
Reusable for multiple uses
Convenient elliptical sleeve design
Suitable for high pressure
Compatible with polyurethane and nylon
#TOP 6

ERGAOBOY 2 Pcs 8mm OD x 8mm OD 304 Stainless Steel Compression Tube Union Connector, Heay Duty SUS 304 Compression Fitting

PA-332
Silver
8MM-8MM
ERGAOBOY 2 Pcs 8mm OD x 8mm OD 304 Stainless Steel Compression Tube Union Connector, Heay Duty SUS 304 Compression Fitting Cover
ERGAOBOY 2 Pcs 8mm OD x 8mm OD 304 Stainless Steel Compression Tube Union Connector, Heay Duty SUS 304 Compression Fitting

Features
Working Parameters: 0-9 MPA And -40-200°C.
Size: 8mm OD X 8mm OD 304 Stainless Steel Compression Fitting.
Wide Adjustment: Widely Used In Fuel/air/liquid/oil/gas/vacuum Lines.
Quick Connection: It Is Easy To Install And Dismantle, And It Is Not Easy To Leak When Connecting.
Material: Type 304 Stainless Steel For Higher Strength And Greater Corrosion Resistance
#TOP 7

Sourcing Map 2Pcs Brass Compression Tube Fitting, 8mm Tube OD, NPT Thread, Compression Union Connectors & Sleeves, Brass Straight Coupling Adapter

a24122300ux2976
Brass
Sourcing Map 2Pcs Brass Compression Tube Fitting, 8mm Tube OD, NPT Thread, Compression Union Connectors & Sleeves, Brass Straight Coupling Adapter Cover
Sourcing Map 2Pcs Brass Compression Tube Fitting, 8mm Tube OD, NPT Thread, Compression Union Connectors & Sleeves, Brass Straight Coupling Adapter

Features
Material: Our Compression Tube Fittings Are Made Of Brass, Which Has High Compressive Strength And High-Temperature Ductility. They Are Strong And Durable, Not Easy To Rust Or Fade, And Can Be Used For A Long Time.
Colour: Brass; Material: Brass; Total Width: 19mm / 0.75"; Intermediate Width: 16mm / 0.63"; Tube Diameter: 8mm / 0.31"; Total Length: 42mm / 1.65"; Disassembled Length: 13mm/27mm/13mm / 0.51"/1.06"/0.51"; Hexagonal Side Width (Both Sides): 17mm / 0.67"; Hexagonal Side Width (Middle Head):14mm / 0.55"; Package Content: 2Pcs X Brass Compression Tube Fitting
Wide Application: You Can Quickly Install Or Remove Compression Pipe Fittings As Needed, Easy To Repair Or Replace. They Are Suitable For Non-Corrosive Or Corrosive Piping Systems Such As Oil, Gas, And Water, And Can Be Used For Water Meters, Valves, Etc.
Easy To Use: This Joint Is Good In Air Tightness And Pressure Resistance, Not Easy To Fall Off, Easy To Install, And Does Not Require Welding And Flaring Tools. Just Insert The Pipe Into The Joint, Rotate It, And Tighten It To Complete The Connection.
Design: The Compression Fittings Have Compression Rings And Sleeves, Which Can Firmly Fix The Pipes In The Fittings By Rotating And Pressing Them To Achieve The Connection Of The Pipelines; They Can Ensure A Tight Connection And Prevent Leakage.
#TOP 8

sourcing map 5Pcs Brass Compression Tube Fitting, 5mm Tube OD Connector, NPT Thread Compression Union Connectors & Compression Sleeves Ferrules, Brass Straight Coupling Adapter

a24122300ux2974
Brass
sourcing map 5Pcs Brass Compression Tube Fitting, 5mm Tube OD Connector, NPT Thread Compression Union Connectors & Compression Sleeves Ferrules, Brass Straight Coupling Adapter Cover
sourcing map 5Pcs Brass Compression Tube Fitting, 5mm Tube OD Connector, NPT Thread Compression Union Connectors & Compression Sleeves Ferrules, Brass Straight Coupling Adapter

Features
Material: Our Compression Tube Fittings Are Made Of Brass, Which Has High Compressive Strength And High-Temperature Ductility. They Are Strong And Durable, Not Easy To Rust Or Fade, And Can Be Used For A Long Time.
Colour: Brass; Material: Brass; Total Width: 15mm / 0.59"; Intermediate Width: 13mm / 0.51"; Tube Diameter: 5mm / 0.2"; Total Length: 34mm / 1.34"; Disassembled Length: 12mm/21mm/12mm / 0.47"/0.83"/0.47"; Hexagonal Side Width (Both Sides):13mm / 0.51"; Hexagonal Side Width (Middle Head):12mm / 0.47"; Package Content: 5Pcs X Brass Compression Tube Fitting
Wide Application: You Can Quickly Install Or Remove Compression Pipe Fittings As Needed, Easy To Repair Or Replace. They Are Suitable For Non-Corrosive Or Corrosive Piping Systems Such As Oil, Gas, And Water, And Can Be Used For Water Meters, Valves, Etc.
Easy To Use: This Joint Is Good In Air Tightness And Pressure Resistance, Not Easy To Fall Off, Easy To Install, And Does Not Require Welding And Flaring Tools. Just Insert The Pipe Into The Joint, Rotate It, And Tighten It To Complete The Connection.
Design: The Compression Fittings Have Compression Rings And Sleeves, Which Can Firmly Fix The Pipes In The Fittings By Rotating And Pressing Them To Achieve The Connection Of The Pipelines; They Can Ensure A Tight Connection And Prevent Leakage.
#TOP 9

sourcing map Quick Connect Air Line Compression Fittings 304 Stainless Steel 6mm OD Tube 3 Way T Type Tee Union Splitter Connector

a22010700ux0576
Silver
sourcing map Quick Connect Air Line Compression Fittings 304 Stainless Steel 6mm OD Tube 3 Way T Type Tee Union Splitter Connector Cover
sourcing map Quick Connect Air Line Compression Fittings 304 Stainless Steel 6mm OD Tube 3 Way T Type Tee Union Splitter Connector

Features
Color: Silver; Material: 304 Stainless Steel; Fit For Tube OD: 6mm / 0.24"; Overall Size: 50mm X 32mm / 1.97 Inch X 1.26 Inch (L*W)
The Fitting Is A Fitting With Three Opening For Connecting And Branching Three Pipes With The Same Outer Diameter, With Three Ferrules For Leak-Proof Sealing In High-Pressure Applications, Suitable For Non-Corrosive Media Such As Oil, Water, And Gas
The Tube Fitting Has A Three Ferrule Structure And A Three Way For Connecting Three Pipes Of The Same Outer Diameter. And The Fitting Is Suitable For Steel, Brass, Aluminum, Or Plastic Tubes
Please Confirm The Correct Size Of The Connector Before Ordering
1. The Fitting Is Easy To Install And Maintain.; 2. Made Of 304 Stainless Steel, Corrosion Resistant, No Rust.; 3. Each Opening Has A Ferrule For Good Sealing
#TOP 10

John Guest Acetal Copolymer Tube Fitting, Union Straight Connector, 5/16 Tube OD (Pack of 10) by John Guest

PM0408S
Gray
16 inches
John Guest Acetal Copolymer Tube Fitting, Union Straight Connector, 5/16 Tube OD (Pack of 10) by John Guest Cover
John Guest Acetal Copolymer Tube Fitting, Union Straight Connector, 5/16 Tube OD (Pack of 10) by John Guest

Features
Accepts Nylon And Polyurethane Tube Fittings
Union Straight Connector For Connecting And Disconnecting Two Inline Pipes More Easily Than Couplings
Working Pressure Of Up To 150 Psi
Meets NSF/ANSI Standards 14, 51, And 61 For Quality Assurance
Made Of Acetal Copolymer Plastic For Low Moisture Absorption And High Tensile And Flexural Strength
Buying Guide Image

Frequently Asked Questions (FAQs)

1. What is Union tube?

Union Tube Fitting is a kind of fitting component which is designed to unite two separated pipes. Union Tube Fittings are used worldwide in the industries to join pipes quickly. ... Connection of two pipes with union tube fittings is done by connecting male and female ends with the help of nut.

2. What is a union tee fitting?

The union tee is a push-fit plastic fitting for the connection of plastic, copper, and CPVC pipe. ... The fitting ensures an easier working environment in confined places, is approved for behind the wall installations and removes the need for hot works on site.

Editor's Notes

During our tube fitting union research, we found 306 tube fitting union products and shortlisted 10 quality products. We collected and analyzed 2,681 customer reviews through our big data system to write the tube fitting unions list. We found that most customers choose tube fitting unions with an average price of £20.00.

The tube fitting unions are available for purchase. We have researched hundreds of brands and picked the top brands of tube fitting unions, including sourcing map, Fafeicy, ERGAOBOY, Metalwork, John Guest.

Written by
Tom Law Avatar

Tom Law is an adventurer who has captured his love for nature into all of his works. A native of Newcastle, Tom has always wanted to share beautiful stories alongside the lovely sights of nature. Fortunately, he took into photography on one of his many journeys and gradually grew a passion for it. Tom Law is now an expert photographer who tours the world while creating and keeping memories of his adventures. He frequently puts his thoughts and experiences into writing.