Fluidmaster 400A Anti-Siphon Universal Toilet Tank Fill Valve #1 solution to fix noisy toilets, #1 best-selling toilet fill valve in the world Easy-to-install, universal design fits most toilet models NEW easier to turn tank water level adjustment dial NOW pre-installed shank washer for quicker installation EZ-twist height adjusts between 9 - 14 Replaces old ballcock and outdated valve designs Anti-siphon design eliminates water supply contamination (code approved) 5 year warranty