Water hammer is a dangerous hydraulic shockwave caused when fast-moving water in pipes is suddenly stopped, often by quickly ...

Water hammer can be prevented by installing a water hammer arrestor (about $15). It acts like a shock absorber by allowing the shock wave to dissipate in its air chamber.

WSSC Water officially lifted its boil water advisory on Wednesday for customers in Prince George’s County, ... known as a “water hammer” that can occur when water flow and pressure changes.