OB-217 - Plastic Switch Hitter Outlet Box with Uponor ProPEX Valves and Hammer Arrestors , UnassembledLSP Products OB 217 Plastic Switch Hitter Outlet Box with Uponor ProPEX Valves and Hammer Arrestors , Unassembled All of the great features of our Ice Maker One Stop Box with Hammer Arrester valve. Rough in Kit ( RK) includes box, valves and debris cover. Features Integrated valve and arrestor design Patented hammer arrestor design One box does it all! Built in test cap Easy to install adjustable faceplate Color coded hot and cold handles PTZ1E41485