Sealing Washers have a EPDM rubber material on the bottom surface to seal against both smooth and uneven surfaces. EPDM material prevents against water leaking around the penetration of the screw into the material creating a waterproof seal.
Bonded Seals have a 2-part construction consisting of a structural metal ring and an interference fit NBR rubber seal to ensure proper centering. When compressed, they create a pressure tight seal. Commonly installed in high pressure hydraulic applications, these gaskets can be used in static sealing connections including drain plugs. The steel ring is zinc plated for corrosion resistance in wet environments.
