Connect John Guest 5/16" push-fit to FFL female flare (1/4")
How to join 5/16" (8 mm) OD and 1/4" FFL (7/16"-20 UNF), and what stops it leaking.
Not a direct fit. Joining John Guest 5/16" push-fit to FFL female flare (1/4") needs a John Guest 5/16 to 1/4 FFL flare fitting.
The two ends
- End A
- John Guest 5/16" push-fit (5/16" (8 mm) OD)
- End B
- FFL female flare (1/4") (1/4" FFL (7/16"-20 UNF))
- A seals on
- single O-ring plus stainless collet grab-ring
- B seals on
- mates against a male 45 degree flare face
- Part needed
- John Guest 5/16 to 1/4 FFL flare fitting
The part to buy
A 5/16 push-fit to 1/4 FFL fitting screws its female flare onto a disconnect MFL tail and takes John Guest 5/16 line. This is how you run John Guest imperial line onto a ball-lock or pin-lock corny keg disconnect.
Match the flare gender to the disconnect. Most disconnect tails are male, needing this FFL-ended fitting; buying the MFL version leaves two males that cannot join. Confirm the tail before ordering.
Related connections
Sources: John Guest Speedfit push-fit fitting technical data · MoreFlavor thread types explained (MFL/FFL, NPT, BSP) · KegLand Duotight 9.5mm x FFL (7/16-20 UNF, 1/4 SAE) product data