"Mike Hibbert" wrote in message
. ..
Hello all,

Just fitting an aqualisa shower, and note that in the instructions, it
says that only copper pipe is to be used. It goes on to say the using
polypipe (and stainless steel) will restict the flow.

Happy to use the copper, but my inquiring mind wants to know why that is
the case?

Ideas???

Plastic pipe is reduced in bore because of the inserts at the fittings.
15mm may be approx 12mm.

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