Composite gasket is made of rubber country and golden house ring vulcanized as a whole, is used to seal the thread and flange connection of the sealing ring, ring includes a metal ring and a rubber gasket. Metal ring antirust treatment, rubber ring generally used oil resistant butyl rubber or rubber.

The combined gasket is used for sealing threaded pipe joints and screw plugs. It is generally used together with bayonet type pipe joints to block the oil port. It is mainly used for the end face static seal of the threaded joint of hydraulic valve joints, and is suitable for the end face static seal of the joint of British and American standard inch thread and French and German standard metric thread. Combined seal washer can be divided into type A and type B according to its structure. According to the different packaging can be divided into full package, half package.