The Fluidmaster PerforMAX Universal Fill Valve is a high‑performance toilet fill valve that fits most toilet tanks thanks to its adjustable height range of 9″ to 14″. It is engineered for quieter operation and faster bowl refill, with “vortex refill” technology that boosts performance over standard fill valves. The valve also features dials to fine‑tune both tank water level and bowl refill level, giving you control over water usage. Because it is “universal,” it is designed to work across many brands and models, including both newer low‑flow (1.28 or 1.6 GPF) toilets and older 3.5 GPF units. Made with corrosion‑resistant materials it's designed to last.