How push-fit works
Inside the fitting there are two key parts. The grab ring has small teeth that bite the pipe so it cannot pull out. The O-ring is a rubber ring that squeezes around the pipe — that is the seal. Solid pipe, Seal (O-ring), Solid fitting.
Making a perfect push-fit joint
- Cut the pipe square with a proper plastic pipe cutter.
- For plastic pipe, push a pipe insert fully into the end. It stops the pipe squashing and keeps the O-ring tight.
- For copper, deburr carefully — a sharp edge can cut the O-ring.
- Mark the insertion depth on the pipe.
- Push firmly with a slight twist until the mark reaches the fitting.
- Pull back to check the grab ring has locked.
- Fit the collet clip if supplied.
Why push-fit joints leak
- Pipe not pushed fully in.
- Pipe cut at an angle or scratched.
- No pipe insert in plastic pipe.
- Damaged O-ring from a sharp copper edge.
- Pipe not supported and pulling on the joint.
Pros and cons
- Pro: fast, no heat, easy for beginners and in tight spaces.
- Pro: many fittings can be removed and reused.
- Con: bulkier than copper fittings.
- Con: needs good pipe preparation every time.
