John Guest Reducing Union, 3/8-Inch OD x 1/4-Inch OD - PI201208S-US

John Guest Reducing Union, 3/8-Inch OD x 1/4-Inch OD - PI201208S-US

Create a secure tubing-size transition with this John Guest Reducing Union, 3/8-Inch OD x 1/4-Inch OD. This push-fit reducing union connects the specified larger and smaller tubing sizes without requiring a threaded adapter.

PI201208S-US is a universal/spec-match product selected by its verified dimensions, ratings, connections, or application rather than by appearance alone.

Fitment / What To Verify: Match Connection: 3/8 In. OD x 1/4 In. OD before ordering.

Is it time to replace?

• Common Symptoms: Existing union leaks, tubing size must transition, or a damaged fitting no longer grips or seals the tube correctly.
• Visible/Sensory Cues: Cracked body, damaged collet, scored tubing, leakage at the connection, or tubing that pulls out too easily.

Pro Tip: Cut tubing square, remove scratches at the sealing surface, confirm both outside diameters, and push each tube fully to the fitting stop.

Technical Specifications