Toilet Tank "three inch" Flapper Valve by NUFLUSH Resistant to calcium buildup, easy to clean and keep clean. "No Calsium buildup" means no "Leaks" Most leaks in toilets are caused by flapper not sealing well. Chemical resistant soft polymeres for perfect seal. "Best three inch flapper valve on the market" Bright white ABS so you can keep your flapper cleaner and leak proof