The washer is a flat metal ring that is placed between the connector and the nut.
Non metallic gaskets are gaskets made of non-metallic materials such as asbestos, rubber, synthetic resin, and polytetrafluoroethylene. A non-metallic jacket gasket wrapped with a layer of synthetic resin or other non-metallic gaskets.
Semimetallic gaskets are gaskets made of metal and non-metallic materials, such as spiral wound gaskets or metal clad gaskets. A spiral wound gasket is a gasket made by spirally winding a V-shaped or W-shaped section of metal tape with non-metallic tape. 1) The inner ring of the inner ring is set on the metal ring of the spiral wound gasket inner ring. 2) The outer ring of the outer ring is set on the metal ring of the spiral wound gasket outer ring. B Metal coating
