O-ring refers to the "O" shaped rubber ring section. It is one of the most widely used seals in hydraulic and pneumatic transmission systems. Mainly used for mechanical parts in static conditions to prevent the leakage of liquid and gas medium. In some cases, the O-ring can also be used as a dynamic sealing element for axial reciprocating and low-speed rotating motion. The utility model has the advantages of simple structure, convenient assembly and disassembly, low cost, diverse materials and various sealing forms. Can be used as oil, water, gas and other fluid sealing use. According to different conditions, different materials can be selected to adapt to it. Dongshengdi provides standard O rings according to customer requirements, and can also customize non-standard size.