I changed a washer on my bathroom sink tap, turned back on water at the stopcock and now i have got water hammer everytime we turn off any tap in the house.. I work in the plumb center and have asjed various plumbers how to fix this and they have all said turn the water off at the stop cock and only turn it on as far as needed for the water to come through. i have tried this and it has not worked..
Any ideas ?.
Any ideas ?.