Guest 90 Deg Ball Vlv 1/4 FIPTx3/8 Tb

The John Guest 90-Degree Ball Valve, 1/4" FIPT x 3/8" Tube, from Reliance Worldwide Corporation pairs a quarter-turn shut-off with a directional elbow and a tube-size transition, all in one fitting. It is built for controlling flow to reverse osmosis units, filters, and other point-of-use water treatment equipment, doing the work of three separate fittings in a single compact body.

The 1/4" female iron pipe thread end connects to a threaded port, while the 3/8" push-in end accepts tubing and seals it automatically. The 90-degree body turns the line around a corner, and the integrated ball valve provides a positive shut-off with a simple quarter-turn of the handle. This valve is especially handy where a threaded 1/4" port needs to feed a larger 3/8" tube line while also turning a corner and offering isolation for servicing.

Key Features

• Connection: FIPT x Tube, 1/4" thread to 3/8" tube
• Integrated ball valve for quarter-turn shut-off
• 90-degree elbow body for compact routing
• Corrosion-resistant polypropylene construction
• Push-in tube side seats instantly, no tools required
• Combines size transition, direction change, and shut-off

To install, wrap the FIP end with PTFE tape and thread it onto the mating port, then cut your 3/8" tube square and free of burrs and push it fully into the collet until it bottoms out. A gentle tug confirms the grip, and the O-ring seals the joint automatically. Operate flow with a quarter-turn of the handle, inline for open and crosswise for closed. The integrated shut-off makes filter and membrane changes quick, since you can isolate the line without disturbing the rest of the system. The corrosion-resistant polypropylene construction holds up to continuous service with treated water, and the push-fit side is demountable for maintenance. For combined flow control, direction change, and size transition in residential water treatment plumbing, this John Guest 90-degree ball valve is a smart, multi-function choice.

As part of the John Guest range, this valve works alongside the unions, elbows, tees, and connectors that use the same collet system, so adding combined isolation, direction change, and a size step in one spot is quick and tool-free. Positioning a shut-off right at a component inlet is a best practice that makes routine service a contained task rather than a disruptive whole-system shutdown.