[SPECIFICATIONS]: Both valves are sport a 1/2" MIP Inlet valve with 3/4" MHT (male hose thread) Outlet fittings and Water Hammer Arrestors, [HAMMER ARRESTOR]: With Water Hammer Arrestors installed, the sudden shutoff of water will not cause banging noises and potential damage to the pipes. [QUARTER TURN]; ¼ inch ball valves allows for easy shut-off of water, whenever you need to do maintenance on your appliance or simply to conserve water. [RELIABLE BRASS]: built with top-grade solid brass construction for long term usage and air tight water flow. [EASY TO INSTALL] its simple to attach the valves to your outlet box of choice with copper crimp rings or stainless steel clamps. No need for glue, crimping or soldering. Washing machine valve with 3/4" MHT (male hose thread) x 1/2" MIP (male iron pipe) red handle for hot water and blue handle for cold water inlet. Water hammer arrestor cutaway. The sliding piston absorbs sudden pressure changes and keeps the pipes from banging. ... When a valve closes quickly and stops the flow, that momentum shakes and pounds pipes. A water hammer arrestor cures this condition with a cushion of air that absorbs the momentum.