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Old 04-09-2011, 05:48 AM   #10
Senior Member
City: Maine
Country: USA
Join Date: Feb 2011
Posts: 109
RE: copper supply lines

If the water hammer wasn't there prior to the pump replacement, and you don't have an accumulator, try bleeding the system at the pump or at the highest level you can. The pump may have a plug where you can purge the air out. Chances are there is an air pocket in the system that is causing this. Happens every time we change a pump out.
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