Convert your existing 2” flush valve toilet to Dual Flush technology Save water & money, uses up to 45% less water Retrofits to any 2” flush valve toilet, 1.6 GPF and pre 1994 3.5+ gallon per flush models Easy-to-install and fully adjustable for a wide range of settings, without removing the valve Complete fill & dual flush conversion system Full and half flush, Dual Action toilet flush lever included Replace noisy and slow filling inefficient models PerforMAX High Performance Fill Valve included for 2x greater refill rate