+An O-ring is a toroidal loop, typically of [Elastomer](/wiki/elastomer), engineered to create a static or dynamic [Seal](/wiki/seal). When compressed between two parts, it blocks the passage of fluids or gases, essential in countless mechanical systems. This deceptively simple component is a cornerstone of leak prevention.
+## See also
+- [Gasket](/wiki/gasket)
+- [Fluid](/wiki/fluid)
+- [Pressure](/wiki/pressure)
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