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A true sealing O-ring is a rubber sealing ring with a circular cross-section, also known as an O-ring or O-ring.

It is the most common mechanical design for sealing, with simple manufacturing, reliable functionality, simple installation requirements, and low price.

O-ring can withstand pressure of tens of megapascals (thousands of pounds) and can be used in static applications or dynamic applications where there is relative motion between components, such as rotating pump shafts and hydraulic cylinder pistons.

It can be used in various sealing and shock absorption applications, such as automobiles, buildings, electronics, and medical equipment, and can achieve good sealing effects.

Therefore, a true sealing O-ring is a common and reliable sealing element.