CONNECTION: Center Drain Connection SPECS: 1/2-inch Push-Fit Connection and 3/4-inch Male Hose Thread (MHT) outlet CONTENTS: Includes pre-installed 1/4-Turn hot and cold ball valves, support bracket, and a Snap-On faceplate cover which accommodates up to 1-inch drywall QUALITY: This outlet box is built with one-piece construction and a raised drip guard that helps prevent potential leaks USAGE: It is designed for recessed residential applications water hammer arresters 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.