Fluidmaster 400LSRP4 Leak Sentry Toilet Fill Valve -Pack of 8

  
Too high a refill to the bowl wastes water down the drain. Too low can cause an improper flush or sewer gas to leak into the room. Engineered to last with nine different settings.

The Leak Sentry device alerts you to an internal toilet leak and prevents water waste until the flapper is replaced.