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Thanks for the replys...I haven't got a cold water tank in the loft...and your right when I say "cut off tap" I mean stopcock outside the house... Also the pipes in the loft aren't fixed to the beams... I've increased the pressure to 16 psi, but its still makes a noise....So is it ok for the...

What is "cwsc" ?.

Ok, could someone please help. I've just had some pipes in the loft capped and the pipes that were needed were left and run flush with the beams so I could put some boards down. When I flush the toilet there is a humming or a trumpet type of sound coming from the pipes in the loft, it sometimes...