PRO57 Fluidmaster Pro Series 2" Flush Valve with Adjustable Flapper The Fluidmaster PRO57 Pro Series 2" Toilet Flush Valve. A durable toilet flush valve replacement, complete with a flapper chain float to adjust tank water levels. Built to fit 2" toilet flush valve models. Stop leaks between the tank and bowl with a Pro Series flush valveFast and easy to installFor us with most 2” flush valve toiletsAdjustable float controls tank water level to optimize flushChlorine and hard water resistant durable buildFlapper features built-in Microban to fight bacteria5 year warranty