These EPDM full-face gaskets have two molded concentric inner rings that increase the gasket's radial strength so that fittings require less torque when tightening. Full-face gaskets cover the entire surface area of the flange and include holes to insert flange bolts and ease alignment. The gasket extends to the outside diameter of the flange which prevents dirt and contaminants from entering the joint. These gaskets are typically used with flat-face (FF) flange fittings so that the mating flange components fit flush against the gasket. Full-face gaskets require the joint to be disassembled to install.