NEXT BY DANCO HydroStop Toilet Tank Flapper Replacement, Gray and Chrome, 1-Pack (FLT231T) ELIMINATES LEAKY TOILET FLAPPER: Engineered to eliminate the most common toilet problem of a leaky flapper by it's robust design UNIVERSAL FIT: Easily adjust to work with newer and older toilets. Fits most front, side, and angle mount toilets with standard 2" to 2-1/2" flush valves. STOPS OVERFLOWS: Toilet handle activates spring loaded S.T.O.P. Technology to immediately prevent overflows NO-TOOL INSTALLATION: Drop-in installation requires no tools or tank removal needed DURABLE MATERIAL: Permafit silicone seal is chemical resistant (avoids warping) and a steel cable stronger than a normal flapper chain