High pitched whistle from pipework when flushing a toilet!?
Whenever the toilets in our house are flushed and the cisterns are refilling, the plumbing makes a loud high pitched whistle that really goes through you. I haven't got a clue what's causing it but if a tap is run while the cistern refills, this noise is less evident. Any suggestions as to what is causing this and what I need to do to fix it would be very welcome.
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