What is an O-Ring? An O-ring is a torus, or doughnut-shaped ring, generally molded from an elastomer with a circular cross-section. Rubber O-rings are used primarily for sealing. They are also used as light-duty, mechanical drive belts. So what is an O-ring seal? An O-ring seal is used to prevent the loss of a fluid or gas. The combination of an O-ring and gland constitute the classic O-ring seal assembly.
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