The Watts 0121227 (LF150A) is a Lead-Free Water Hammer Arrestor for quick-closing faucets and appliances such as washing machines and dishwashers.  It features an air-tight sealing cap, sealed-in diaphragm, and stainless steel top and chamber.   The arrestor is pre-charged with air and easily rechargeable by its standard tire valve connection

The water hammer arrestor functions are to control the water pressure entering your appliances and to smoothen water flow output on quick-closing faucets.  The water pressure and air pressure are balanced when the water is being used.  In times of quick shut-off, water pressure increases then the shock is absorbed by the diaphragm.  Afterward, a sudden pressure drop will happen to cause the diaphragm to flex and after few seconds it goes back to the normal stage.

Having this water hammer arrestor is an economical way to avoid water hammering that can damage your appliances and pipelines.  You can easily install the arrestor directly to your appliances by using Watts 0121229 Brass Hose Adapter.
 

Ordering Guide of Watts Water Hammer Arrestor Assembly: