Guest FIPTxTube Conn. 1/4x3/8

Connecting 1/4" tubing to a larger 3/8" female-threaded port is exactly the job the John Guest 1/4" x 3/8" Female Adapter (FIPT x Tube) is built for. The push-fit end accepts 1/4" tubing via the signature John Guest collet, while the other end provides a 3/8" female iron pipe thread, bridging small tubing to a larger threaded connection in a single reliable fitting.

Reliable reducing connections

This reducing female adapter is handy whenever a system steps between 1/4" tubing and a 3/8" threaded component, such as certain pumps, valves, or housings. The push-to-connect collet grips and seals the tubing automatically and holds it against system pressure, while the durable polypropylene body resists the corrosion and chemical exposure typical of water treatment service, ensuring a long, leak-free life.

• John Guest 1/4" tube x 3/8" FIPT female adapter
• Push-to-connect collet for fast, tool-free tube connection
• Provides a 3/8" female threaded port
• Bridges 1/4" tubing to larger 3/8" threaded components
• Durable polypropylene construction for water systems
• Reusable design allows tubing removal and reconnection

For a dependable seal, push the squarely cut tubing fully into the collet until it bottoms out, then seal a male fitting into the FIPT end with PTFE tape before tightening. A gentle tug confirms the tube is locked before you turn the water on, and the collet releases the tube with a simple press of the ring whenever you service the system. This reducing female adapter is a practical addition to any RO or filtration installation that needs to transition from 1/4" tubing to a 3/8" threaded port, sparing installers from stacking multiple fittings and giving them a single clean, reliable connection point.

For technicians who service a range of RO and filtration equipment, keeping these reducing adapters on hand means you are ready whenever a system steps from 1/4" tubing to a 3/8" threaded port. Reliable, durable, and quick to connect, this John Guest fitting simplifies otherwise awkward transitions into a single clean joint. From a single under-sink RO install to a full commercial system, this John Guest reducing female adapter delivers the same quick, leak-resistant tubing-to-thread transition that professionals rely on throughout water treatment plumbing.