O-ring seal refers to the section of the "O" - shaped rubber ring.It is the most widely used type of hydraulic and pneumatic transmission system.Mainly used for mechanical parts in static conditions to prevent the leakage of liquid and gas medium.In some cases, O - rings can also be used as a dynamic sealing element for axial reciprocating and low speed rotary motion.It has simple structure, convenient installation, low cost, easy maintenance and various materials.Can be used as oil, water, gas and other a variety of fluid sealing.According to different conditions, different materials can be selected to adapt to it.