ED ring is one of the many industrial seals. As aspecial seals for the pneumatic and hydraulic joints, such as pipe joints, hydraulic plugs, and transition joints etc.,it has better sealing effect than traditional O-Rings. When this elastomeric seal is used as an axial static seal for threaded ports and screw ends.the cross section remains nearly constant under high pressures. Folon.A as the first one to introduce ED-Ring manufacturing into China, is now the absolute market leader.