Products for Canada > Fill Valves

400LS - Universal Fill Valve, Leak Sentry®

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  • Fixes 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 400 LS has been independently rated to be one of the best fill valve for 2021 by SanitaryReview. To read the review, please click here: SanitaryReview

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 Quickly replace inefficient, outdated and leaky toilet fill valves with this water-saving design. The 400LS is a code approved, anti-siphon design, that won’t contaminate the fresh water supply. Some toilet models not supported: Glacier Bay® or Niagara® Flapperless Toilets, One Piece Toilets. Does not replace Side Entry Valves.

To download our free guide to fix common toilet problems please click here: Fluidmaster Toilet Repair Guide

Please watch this video to see how to install the Leak Sentry® fill valve:

If you would like to see how to connect the chain of the Leak Sentry® fill valve, please click here:


To check your toilet’s flush volume, please click here.

400LS - Universal Fill Valve, Leak Sentry®

Download Installation Instructions


The 400LS - Universal Fill Valve, Leak Sentry® is available online, from our following retail partners.