Union Tee, 3/8″ x 3/8″ x 1/4″ (John Guest)

Description

The John Guest Union Tee 3/8" x 3/8" x 1/4" is a high-quality push-fit fitting designed to create a three-way connection between different tubing sizes in reverse osmosis systems, drinking water filtration systems, refrigerator water lines, and other potable water applications. This reducing tee allows you to connect two 3/8" OD tubing lines with a 1/4" OD branch connection, making it ideal for adding accessories, connecting smaller components, or adapting water lines within a filtration system.

Featuring John Guest's trusted push-fit technology, this fitting provides a quick, secure, and leak-resistant connection without the need for tools, clamps, or adhesives.

Key Features

• Reducing Tee Configuration: Connects 3/8" x 3/8" tubing with a 1/4" branch outlet.
• Push-Fit Technology: Installs quickly without soldering, glue, or clamps.
• Secure Leak-Resistant Seal: Built-in O-rings provide a reliable watertight connection.
• Food-Grade Materials: Safe for potable drinking water applications.
• Reusable Design: Tubing can be removed and reconnected using the release collet.
• Compact Design: Ideal for tight installations and water treatment equipment.
• Durable Construction: Designed for long-term use in residential and commercial systems.

Compatibility

The John Guest Union Tee 3/8" x 3/8" x 1/4" is compatible with:

• Reverse osmosis systems
• Drinking water filtration systems
• Refrigerator water lines
• Ice maker connections
• Water coolers
• Beverage dispensing systems
• Residential and commercial filtration equipment

Compatible tubing sizes:

• 3/8" OD polyethylene tubing
• 1/4" OD polyethylene tubing
• John Guest and compatible push-fit tubing systems

Specifications

Product Type – Reducing Union Tee

Brand – John Guest

Connection Size – 3/8" OD x 3/8" OD x 1/4" OD

Fitting Type – Push-Fit Tee

Body Material – Food-Grade Acetal Copolymer

Seal Material – EPDM O-Rings

Installation – Push-Fit

Application – Potable Water Systems

Applications

The John Guest Reducing Union Tee is ideal for:

• Reverse osmosis installations
• Drinking water filtration upgrades
• Connecting RO accessories
• Adding pressure gauges or monitoring devices
• Refrigerator and ice maker water lines
• Water cooler installations
• Beverage dispensing systems

It provides a simple way to branch a water line while transitioning between 3/8" and 1/4" tubing sizes.

Installation

1. Cut tubing ends square using a proper tubing cutter.
2. Ensure tubing is clean and free from burrs or damage.
3. Push each tube fully into the correct fitting port until it reaches the internal stop.
4. Pull gently on each tube to confirm the connection is secure.
5. Turn on the water supply and inspect for leaks.

💡 Proper tubing insertion is essential for creating a reliable push-fit seal.

Maintenance

For best performance:

• Inspect fittings regularly for leaks or wear.
• Keep tubing supported to prevent stress on the fitting.
• Disconnect tubing only by pressing the release collet.
• Replace the fitting if damaged or if it no longer seals properly.

Why Choose John Guest Push-Fit Fittings?

John Guest fittings are trusted throughout the water treatment industry for their reliability, easy installation, and long service life. The 3/8" x 3/8" x 1/4" Union Tee provides a dependable solution for branching and adapting tubing connections in residential and commercial filtration systems.