Marrkk said:If you do need hammer arrestor, the old fashioned method of installing a 12 to 18" section of capped pipe above the outlet (using a tee in the vertical orientation) does the job. The beauty is that it has no moving parts to wear out (it works by trapping a cushion of air in the vertical section). Some will tell you that over time these will fill with water, negating their function, but if it happens (you start to get hammering), a quick shut off of the water supply and drain of the system by opening a hose bib or other low mounted outlet will empty the pipe sections and get you back in business
They MAY only refill if the pipes are arranged so them drain completely, which few systems are, and if the air chamber is able to drain the water by allowing air in to break the vacuum produced at the top by the lack of air in the chamber.
A shower would not likely to be where water hammer occurs. Dishwashers, clothes washers, fast closing lavatory faucets, and toilet fill valves are the most likely culprits. If water hammer does occur you can install the Sioux Chief arrestors on the device causing it.
It's more likely something like a toilet.
The Korky Quietfill is much better for that.
This is awkward, but...
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