John Guest Fittings

About

John Guest fittings are push-fit connectors for joining beer and gas lines in home brew kegging setups without tools or clamps. You push the tube in to seal it and press the collet to release it. Our range is built around 3/8" line, with straights, elbows, end stops, locking clips, reducers to 1/4", 5/16" and 3/16", and a 3/8" × 1/4" FFL female adapter for threaded ball lock disconnects. Buying guide & FAQs Which John Guest fitting do I need? Joining two lines of the same size: Equal Straight 3/8" , or the Equal Elbow 3/8" for a 90° turn. Changing line size: Reducing Straight 3/8" to 3/16" , 3/8" to 1/4" or the Reducing Elbow 3/8" to 5/16" . Connecting to a disconnect: the 3/8" × 1/4" FFL Female Adapter screws onto 1/4" MFL threaded disconnects such as our liquid and gas ball lock disconnects . Closing off a line: End Stop 3/8" . Stopping accidental release: Locking Clips 3/8" (pack of 10) slip behind the collet. How to fit push-fit connectors Cut the tube cleanly and squarely, push it firmly into the fitting past the O-ring until it stops, then pull back gently to check it's gripped. To release it, push the collet in and hold it while you pull the tube out. Always release the pressure first. Pair them with our MDPE beer line in 3/16", 5/16" and 3/8", and clean the lines regularly with Pipeline beer line cleaner . Frequently Asked Questions How do John Guest push-fit fittings work? An internal collet grips the tube and an O-ring seals it. You push the tube in to connect it, and press the collet to release it. No tools are needed. How do I connect beer line to a ball lock disconnect? Use the John Guest 3/8" × 1/4" FFL female adapter. It screws onto a 1/4" MFL threaded disconnect and gives you a 3/8" push-fit socket for your line. See our guide to cleaning beer lines . Can I join different sizes of beer line? Yes. Use a reducing straight or reducing elbow. We stock 3/8" to 3/16", 3/8" to 1/4" and 3/8" to 5/16". Why is my push-fit fitting leaking? Usually the tube