The Fluidmaster 6100 Universal Tank-To-Bowl Gasket is designed to provide protection and securely seal your toilet tank to toilet bowl. The 6100 is a universally designed toilet bowl gasket that fits most close-coupled 2” flush valve models. The sponge rubber material is strong yet malleable to fit, and provide a superior seal. This product offers a high quality solution to rocking toilet tanks. For proven protection at a common leak point choose Fluidmaster’s 6100 Tank to Bowl Gasket. Not for use in Gerber toilets, hardware sold separately.