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A silicone waterproof o-ring is a mechanical gasket in the shape of a torus; it is a loop of elastomeric with a disc-shaped cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. Silicone waterproof o-rings are one of the most common seals used in machine design because they are inexpensive, easy to make, reliable, and have simple mounting requirements. They can seal tens of megapascals (thousands of psi) pressure.