John Guest 10mm push-fit: 10 mm OD tube, push-fit collet, metric, seals on single O-ring plus a stainless collet grab-ring. What it fits and the adapters to join it to other keg fittings.
Updated 05 September 2026.
John Guest 10mm push-fit (10 mm OD)
Where 10 mm OD is used, its real dimensions, and how to connect it to other keg fittings.
Published dimensions
- Designation
- 10 mm OD
- Size / thread
- 10 mm OD tube
- Fitting form
- push-fit collet, metric
- Seals on
- single O-ring plus a stainless collet grab-ring
- Rating / role
- John Guest Speedfit metric fittings for 10mm OD tube
- Tube OD
- 10 mm
Used on: larger beer and gas runs on European draft kit specified in metric.
10mm is a metric John Guest size that sits between the 3/8 (9.53mm) and 1/2 imperial sizes. It does not interchange with either; a 10mm collet is sized for 10mm OD tube. Confirm your tube is genuinely 10mm before buying, because 3/8 tube will not seat properly in it.
Flare fittings seal on the 45 degree flare face and must never be taped. Push-in fittings seal on an O-ring against the tube wall and need the tube cut square. Barbs seal under a worm clamp. Getting the sealing method right matters more than the thread label, because most homebrew leaks are a taped flare or an unclamped barb.
Connect this fitting
Questions and answers
What is the designation of the John Guest 10mm push-fit (10 mm OD)?
10 mm OD
What is the size / thread of the John Guest 10mm push-fit (10 mm OD)?
10 mm OD tube
What is the fitting form of the John Guest 10mm push-fit (10 mm OD)?
push-fit collet, metric
What is the seals on of the John Guest 10mm push-fit (10 mm OD)?
single O-ring plus a stainless collet grab-ring