This Inline Check Valve Union is designed for 1/4″ OD quick connect (push-fit) tubing
and helps prevent backflow in reverse osmosis (RO) and water filtration systems. The built-in
one-way check valve allows water to flow in one direction only, helping protect components and maintain
proper system performance.

The union (tube-to-tube) design connects two sections of 1/4″ OD tubing quickly and securely.
Simply push the tubing into both ends until fully seated for a leak-resistant seal—no tools required.

Key Features

• Function: One-way check valve to prevent backflow
• Connection Type: 1/4″ OD tubing x 1/4″ OD tubing (Quick Connect / Push-Fit Union)
• Easy Install: Push tubing in to connect; remove with collet release
• Use Case: Helps maintain correct flow direction in RO and water filtration systems
• Material: Durable, food-grade plastic construction

Typical Applications

• Reverse osmosis (RO) systems
• Water filtration and purification systems
• Ice maker / refrigerator water lines (1/4″ OD tubing)
• Inline plumbing setups where backflow protection is needed

Installation Notes

• Flow Direction: Install according to the arrow on the fitting (water flows in the arrow direction).
• Cut tubing square for best seal and push tubing in fully until it bottoms out.
• To disconnect, press the collet in and pull tubing out.

Note: For use with 1/4″ OD polyethylene RO tubing. Not intended for soft vinyl tubing.
Please confirm flow direction before pressurizing the system.