The model 400A valve has a back-flow preventer and is anti-siphon code approved. Height adjusts from 9" to 14" to fit most tanks. And, the water level adjustment clip can be set to the most efficient flush level.
Anti-siphon design prevents contamination of household drinking water.
Water level adjusting screw for best flush.
Shank adjusts valve height from 9" to 14" to fit most standard typical toilet tanks.
Torque guard locknut prebents thread damage from overtightening the nut.