I saw this on Google:
How you fix this is easy. You can either buy an anti-hammer kit at a do it
yourself store or an even easier way is to solder a "T" on the pipe that has
it's end capped and is facing upwards.
This typically will prevent the hammering because it presents a space for the
turubulent water to shoot up into. It only has to be about a foot long.
Pat
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