Push-fit fitting leaking — how to fix without soldering

Push-fit fittings (Speedfit, Hep2O, John Guest) use an internal O-ring and grab ring to seal and hold the pipe. They are quick and tool-free to fit, but can leak if the pipe is not fully inserted, the pipe end is not cleanly cut, or the O-ring is damaged.

Isolate and drain the affected section. To release the fitting: press the collet (the grey or blue ring around the pipe entry) firmly into the fitting body while simultaneously pulling the pipe out. A dedicated release tool makes this easier, but a pen barrel pushed against the collet works on most fittings.

Inspect the pipe end: it must be cleanly cut square (not at an angle), deburred inside and out, and free from score marks or scratches. Even a small nick can allow water past the O-ring. If in doubt, cut a fresh 20–30mm section of pipe to get a clean end.

Inspect the fitting itself — look at the O-ring inside the fitting. If it is damaged, distorted, or has a piece of debris on it, the fitting will leak. Some manufacturers (Hep2O, John Guest) sell replacement O-rings; alternatively, replace the whole fitting (£1–£5).

When reinserting: push the pipe firmly into the fitting until you feel it stop — on most 15mm fittings this is approximately 20mm insertion depth. You should feel a positive click from the grab ring. Mark the pipe at the fitting face with a marker pen to confirm full insertion.

For pipes in awkward locations, consider using flexible push-fit connectors which allow some movement after fitting, reducing the risk of joint stress from thermal expansion.