Description Flush Valve Tank-to-Bowl Dry Gasket (3.6 inch x 2.1 inch) (91mm x 53mm) 91mm x 53mm 3.6 inch Outer Diameter x 2.1 inch Inner Diameter 2.8 inch (71mm) Inner Lip 1 in or 25mm Tall Fits two piece toilets Sits between toilet tank and base to protect porcelain Fits Flush Valve. FLUSH VALVE NOT INCLUDED