Guest 3/8 Faucet Connector

The John Guest 3/8" Faucet Connector from Reliance Worldwide Corporation connects 3/8" push-fit tubing to a UNS faucet thread, providing a clean, tool-free way to feed treated water to a dedicated drinking-water faucet or dispenser in reverse osmosis and filtration systems. It forms the final link in the chain that delivers filtered water to the point of use.

Dedicated RO and filter faucets typically use a UNS-style threaded shank beneath the sink. This connector mates that thread to your 3/8" tube line, so the last run from the system to the faucet completes quickly without adapters stacked on the tube side or wrenches fumbling in a tight cabinet. The push-in collet grips and seals the tubing automatically the moment it is seated.

Key Details

• Connection: 3/8" tube to UNS faucet thread
• Purpose-built for dedicated treatment faucets
• Corrosion-resistant polypropylene construction
• Push-in tube side seats instantly, no tools required
• Demountable for easy faucet servicing
• Won't scale or corrode in continuous service

To install, thread the connector onto the faucet's UNS shank beneath the sink, taking care not to cross-thread, then cut your 3/8" tubing square and free of burrs and push it fully into the collet until it bottoms out. The internal O-ring forms a watertight seal automatically, and a gentle tug confirms the grip. Because polypropylene resists corrosion and scale, the connector holds up to continuous contact with treated water far better than many metal alternatives. When the faucet or line needs servicing, depress the collet to release the tube cleanly, then reconnect once the work is finished. As the final junction between your filtration system and the point of use, this John Guest faucet connector ensures a reliable, leak-free supply of treated drinking water at the tap.

Compatibility with the rest of the John Guest range means the run feeding your faucet can use the same unions, elbows, and valves found throughout the system, keeping the whole layout consistent and easy to service. Because the final connection is push-fit and demountable, swapping a faucet or reworking the under-sink plumbing later is a quick, tool-free task rather than a frustrating fight in a cramped cabinet.