An O ring is a circular seal made of elastomeric materials that are used to prevent leakage of fluids or gases between two parts of a machine, instrument or system. The name "O ring" refers to its shape, which is typically circular and has a cross-sectional diameter that is equal to or slightly larger than the diameter of the groove in which it is installed.O rings can be made from a variety of materials, including rubber, silicone, fluorocarbon, and polyurethane, depending on the specific application and the type of fluid or gas being sealed. They are commonly used in hydraulic and pneumatic systems, pumps, valves, and other industrial equipment.

O rings work by creating a seal between two parts that are pressurized, preventing any leakage of fluid or gas through the interface. The material of the O ring is specifically chosen to be flexible enough to seal against the parts it is compressing against, yet rigid enough to resist cracking, deformation, or disintegration over time.

It's ease of service, no smearing and O-rings normally require very little room and are light in weight. In many cases an O-ring can be reused, an advantage over non-elastic flat seals and crush-type gaskets. The duration of life in the correct application corresponds to the normal aging period of the O-ring material. O-ring failure is normally gradual and easily identified. 


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