An inline one-way check valve that connects two sections of 1/4″ OD tubing and prevents backflow — water flows in one direction only. Essential for maintaining correct flow direction in RO and water filtration systems.

What it does

This inline check valve has a built-in one-way valve inside a tube-to-tube union body. Water flows through in the direction of the arrow on the fitting; if pressure reverses, the valve closes and blocks flow. Both ends are 1/4″ OD push-to-connect.

Use it wherever backflow could contaminate purified water or disrupt system operation — common on the output side of an RO membrane, between a storage tank and a faucet, or anywhere gravity or back-pressure could push water the wrong way.

Key benefits

• ✓Built-in one-way check valve — prevents backflow and contamination
• ✓1/4″ QC × 1/4″ QC — push-fit tube-to-tube, no threads
• ✓Flow-direction arrow — install in the marked direction
• ✓Protects RO membranes, filters & dispensing components
• ✓Works with countertop RO, under-sink RO, inline filters & ice makers
• ✓Automatic quantity discounts starting at 2 units

Specifications

Compatibility

Often used with

Good to know before you buy

• Check the flow-direction arrow on the fitting body before installing. Water flows in the arrow direction only.
• Cut tubing square and push fully into each port.
• Do not install backwards — the valve will block all flow if reversed.
• After installation, verify water flows through in the correct direction before putting the system into service.