WATER-SAVING TOILET FLUSH VALVE: The HydroRight replacement toilet flush valve easily converts most standard toilets into a dual-flush water-saving toilet which uses up to 70% less water for liquids and paper REPAIRS COMMON LEAKY TOILET ISSUES: Eliminates the most common problems in toilets that cause leaks as this flush valve replaces a worn-out toilet flapper, chain and handle which can often break COMPATIBILITY: Fits 1.6 to 3.5+ GPF (gallons per flush) standard 2-piece toilets with 2 in. flush valve and requires 10-inch minimum clearance from highest point of the flush valve opening to the inside of the tank lid; Note: Will NOT FIT Mansfield toilets and is not compatible EASY NO-TOOLS REQUIRED INSTALLATION: Simple Drop-in installation without tools in less than 20 minutes with NO TANK REMOVAL required BUILT TO LAST: Constructed of durable plastic and the Perma fit silicone seal is chemical resistant and will not warp