What is the purpose of a water hammer arrestor?

The purpose of a water hammer arrestor is to absorb shock caused by sudden changes in water flow. When a valve closes quickly or a water flow is suddenly interrupted, it can create a pressure surge or shockwave within the plumbing system, often referred to as "water hammer." This phenomenon can lead to loud banging noises and potential damage to pipes and fixtures.

A water hammer arrestor acts as a cushion, utilizing a compressed air chamber to absorb these shocks. By doing so, it prevents the rattling and potential structural damage that could occur from these sudden changes in pressure. This device thus plays an essential role in ensuring the longevity and integrity of plumbing systems, while providing a quieter operation.