i added a heated towel rail in a pressurised system. i had to join some Grey plastic pipe to Speedfit (white) pipe and then to copper.
The speedfit fittings were no problem connecting Grey to Speedfit pipe, and then Speedfit pipe to copper. (all 15mm pipe)
You do need to cut the polypipe with a special cutter and make sure the copper pipe has been cut properly with a pipe slicer, also no burred edges to damage the seals.
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