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O-ring is a common sealing element widely used in various hydraulic systems for sealing oil and other liquids. It is usually made of rubber or plastic and has characteristics such as good sealing performance, high temperature resistance, oil resistance, and chemical resistance.

In hydraulic systems, O-rings are placed at the ends of various shafts and pipelines to prevent oil and other liquids from leaking. They are designed to closely fit with the corresponding mating surfaces and provide reliable sealing effects.