Abstract: A sealing washer, comprising a rigid body having opposite, disc-shaped surfaces defining parallel planes, and a central opening defined through the rigid body along a central axis thereof; and multiple, concentric, polymeric sealing rings projecting away from the plane defined by each of the disc-shaped surfaces of the rigid body, the sealing rings being generally coaxial with the central axis, and each sealing ring being deformable in response to compression forces applied to the plane defined by each disc-shaped surface.