"I'd previously only used Speedfit on copper pipe. Doing a temporary run with plastic pipe was a first and these inserts are needed. Also, do give the pipe that extra push into the fitting so the arrows (unused cut point) go up to the collar. You'll know this if you read the instructions on the packet.
No leaks, which is key. The fittings are a bit bulky which may be an issue if you are hiding a run."
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Review 4 for JG Speedfit Plastic Pipe Insert 22mm Pack of 25