The Fluidmaster 400H-002 PerforMAX High Performance Universal Toilet Fill Valve offers the best in toilet fill valve replacement. This fill valve sets the performance standard and features new upgrades for even more water-savings and faster installation. The most powerful fill valve in the market generating 2X greater refill rates than standard designs with ultra-quiet operation. Installation is simple with a pre-installed shank washer and new step-by-step pamphlet instructions for the fastest and easiest repair possible. A universal toilet fill valve this design fits most brands. Featuring EZ-twist shank height adjustment from 9 in. to 14 in. to fit more tanks. Best for use in 1.28 HET and 1.6 GPF toilets but can also be used with pre-1994 3.5 GPF toilets. Designed to save-water with adjustable tank water level and bowl water level dials that are easy to use. Customize your water use per flush depending on your needs or toilet model. The PerforMAX Fill Valve is a code approved anti-siphon design th