American Standard RU108 Flash Shower Rough-in Valve Material Stainless Steel, Brass Inlet Connection Type Cross Linked Polyethylene Outlet Connection Type PEX About this item Choice of Connections: Fast and easy installation without adaptors reducing leak points. Available connections include Universal (male thread/female sweat), PEX Crimp, PEX Cold expansion, CPVC, and Stub-outs Cast Brass Valve Body: Durable. Ideal material for prolonged contact with water Flat Back: Allows valve to be mounted flush against cross brace for easy and solid installation Test Cap: Allows valve body to be tested and flushed without the presence of the valve cartridge. Can be tested using test cap with air (200 psi) or water (300 psi) Stainless Steel Retaining Ring with Flats: Secures test cap/ cartridge in place and eliminates need for screws. Flats make it simple to loosen ring for quick, easy insertion/removal of test cap/cartridge PEX Connections: Fast and easy installation without adaptors reducing leak points. Back-to-Back Capability: Hot and cold can be reversed quickly and easily.