Fluidmaster®’s 400A Universal Toilet Fill Valve is the top selling and most recognized fill valve in the worldwide. A universal design, with an adjustable height from 9″ to 14″ to fit most toilets and tanks. The 400A offers quick refill rates and replaces ballcocks and other toilet fill valves. This trusted and proven toilet fill valve, is built to last from corrosion-resistant materials for a long lifespan. The code approved, anti-siphon design, won’t contaminate the fresh water supply. Fix a slow filling toilet with the 400A Toilet Fill Valve.