Construction
Water Hammer Arrestor Calculator
Banging pipes when a valve shuts? You need water hammer arrestors sized to PDI Standard.
Arrestor size
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- PDI rating
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- Branch WSFU range
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- Install at
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FAQ
Do I need one at every fixture? +
No — one arrestor near the noisiest valve (washer, dishwasher, ice maker) usually handles a branch.
Air chamber stubs? +
Old-school 12" capped vertical pipe stubs work for a year, then fill with water and stop working. PDI cartridge arrestors are permanent.