Having added an extra cold water pipe run in our utility room, there is
a tendency for water hammer elsewhere in the system if taps are turned
off with enthusiasm (about the only enthusiasm my son shows about anything!)
I have seen this product http://tinyurl.com/l2wxvv in the toolstation
catalogue and wonder if it is critical whereabouts in the system it is
installed. I can see an argument for it to be on the rising main after
the meter before any branches off to taps etc but on the other hand
could it be almost anywhere as all the pipes are hydraulically linked?
Presumably there is a diaphragm and damped spring arrangement inside?