The Fluidmaster Leak Sentry Toilet Fill Valve is easy to install and fits most toilets. It will prevent automatic refill of leaky tanks. The anti-siphon design prevents contamination of household drinking water and the water level adjusting screw makes for the best flush. The Torque Guard locknut prevents thread damage from overtightening the nut. The height adjusts from 9″ to 14″ to fit most tanks.