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Water hammer arrestor
A water hammer arrestor is a device that cushions pressure spikes in plumbing.
Why it matters
It reduces banging and helps protect connections.
Where people get this wrong
An arrestor is not a fix for every noise. Some noise is loose piping. Placement matters. It needs to be near fast-closing valves.
Real-world example
A washing machine shuts off and the pipes bang every time. An arrestor is like a shock absorber for that pressure spike.
Where this hits your build
This term shows up during construction and affects decisions that are hard to reverse once the work moves forward. Understanding it now saves time, money, and frustration later.
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