The Eastman 1/2 inch Expansion PEX Center Drain Washing Machine Outlet Box with Hammer Arresters provides a safe water supply installation for washing machines. It is a one-piece box built with high-impact, non-corrosive plastic. It has a recessed design that accommodates 1-inch drywall. It comes with a pre-installed support bracket, a faceplate cover, and 1/4-turn hot and cold ball valves for shutoff during maintenance. The valves include hammer arrestors that prevent pipes from shaking and pounding. This washing machine outlet box has a 1/2-inch Expansion PEX inlet connection and a 3/4-inch male hose thread outlet. It is designed for residential applications. CUPC approved.