American Standard R119 Pressure Balance Rough Valve Body Cast brass valve body: durable - quality that will last a lifetime. Ideal material for prolonged contact with water Ceramic disc valve cartridge: assures a lifetime of drip-free performance. Allows easy fine tuning of temperature (125handle rotation from off to hot) Pressure balancing valve cartridge: maintains constant output temperature in response to changes in hot and cold Supply pressure. Diaphragm system engineered to eliminate Cross flow. Avoids failure due to mineral deposits - ideal for use in hard water pressure balancing valve cartridge: maintains constant output temperature in response to changes in hot and cold Supply pressure. Diaphragm system engineered to eliminate Cross flow. Avoids failure due to mineral deposits - ideal for use in hard water Back-to-back capability: hot and cold can be reversed quickly and easily Adjustable hot limit safety stop: limits the amount of hot water allowed to mix with cold. Reduces the risk of accidental scalding