Fluidmaster 400H ® toilet fill valve is one of the most quietest fill valve with the most powerful flush. The 400H comes with both tank and bowl water control for a more powerful flush. The adjustability of the bowl water helps this valve work in all older as well as newer toilets. If your toilet is slow filling, noisy or is running constantly, then replace your fill valve with the Fluidmaster PerforMAX® 400H valve.