Re: thanks hj and.........
Posted by hj on August 15, 2002 at 00:44:11:
In response to Re: thanks hj and.........
Since it is full of air, initially, when water impacts a fast closing valve such as a washing machine or dishwasher, the air can compress and absorb the inertia. Water itself, not being compressible, would send the shock wave back and forth through the pipe causing the water hammer effect.

: It is vertical and is on the hot and cold water pipes. I have also seen this under kitchen sinks.

: How exactly does this stop water hammer?
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