American Standard R120SS20SS Pressure Balance Rough Valve Body Only Direct Sweat Inlets and Outlets with Screwdriver Stops,American Standard,R120SS" /> Shower valve Rough in valve Pressure balancing Bath / shower accessory Brass pressure balance valve body Ceramic disc valves assures a lifetime of smooth handle operation and drip-free performance Turns water on and off and adjusts temperature Gives added benefit of adjusting flow of water from a trickle to full force