Guest 1/4tx3/8m Adptr

When a system needs to connect 1/4" tubing to a 3/8" male-threaded port, the John Guest 1/4" Tube x 3/8" Male Connector makes the transition clean and reliable. The push-fit end accepts 1/4" tubing through the trusted John Guest collet, while the other end provides a 3/8" male iron pipe thread for mating with a female-threaded component, all in one compact reducing fitting.

Step up to a larger thread with ease

This reducing male connector is useful wherever small-diameter tubing meets a 3/8" threaded fitting on a pump, valve, filter housing, or accessory. The push-to-connect collet grips and seals the tubing instantly without tools and holds it against system pressure, and the durable polypropylene construction stands up to the corrosion and chemical exposure common in water treatment service, giving you a dependable joint that lasts.

• John Guest 1/4" tube x 3/8" MIPT male connector
• Push-to-connect collet for instant tube connection
• Provides a 3/8" male threaded end
• Bridges 1/4" tubing to 3/8" female-threaded ports
• Durable polypropylene resists corrosion and chemicals
• Reusable collet allows tubing removal and reconnection

To install, cut the tubing squarely with a tube cutter and push it fully into the collet until it seats, confirming the lock with a gentle tug, then wrap the 3/8" male threads with PTFE tape for a leak-free joint before threading into a female port. Press the collet ring to release the tube whenever you service the line. This reducing male connector is a versatile, space-saving fitting for reverse osmosis and filtration systems that need to join 1/4" tubing to a larger threaded connection, letting installers complete the transition in one step rather than combining several adapters.

For installers who work across varied RO and filtration setups, keeping these reducing male connectors in the kit means you are always prepared when a system steps up from 1/4" tubing to a 3/8" threaded port. Reliable, durable, and quick to connect, this John Guest fitting turns a tricky size transition into a simple, dependable joint. From new builds to repairs and upgrades, this John Guest reducing male connector is the everyday fitting that lets installers join 1/4" tubing to a 3/8" threaded port cleanly and reliably, every time.