Description The Fluidmaster 400LS Leak Sentry Water Saver Ballcock is a code approved, anti-siphon design, that wonât contaminate the fresh water supply.PRODUCT DETAILFixes noisy toilets and detects leaks Easy to install, Universal fit Leak Sentry prevents the automatic refill of a leaky tank Water-saving roller clamp lets you regulate the fill level in the bowl E-Z Twist height adjusts from 9" to 14" to fit most tanks 5 year warranty Fluidmaster recommends using the 400LS fill valve in toilets that date prior to 1994 with flush volumes between 7 gallons per flush and 3.5 gallons per flush. The 400LS Leak Sentry Universal Water Saving Toilet Fill Valve has all the same benefits of the 400A fill valve, plus it comes with leak prevention technology and a water-saving roller clamp. Leak prevention technology stops the automatic refill of the toilet tank due to a worn or faulty flapper. The included roller clamp allows you to regulate the amount of water refilling the toilet bowl for maximum efficiency. Quickly replace inefficient, outdated and leaky toilet fill valves with this water-saving design.