K-300-K-NAAdjustable 1/2 Inch Tub ValveDeck Mounted This 1/2-inch ceramic valve works behind the scenes to give you optimal performance from your KOHLER faucet. It features brass construction for durability and long-lasting ceramic valves that offer a lifetime of smoothly functioning water flow. High-flow valve ensures optimal water flow performance. Quarter-turn ceramic disc valves exceed industry longevity standards ensuring durable performance for life. 15.0 to 17.0 gpm gallons per minute flow rate. For use with bath- or deck-mount faucets. Requires valve trim sold separately. Brass construction.