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<p>[QUOTE=&quot;imrich, post: 2490141, member: 22331&quot;]Normally accepted definition for a gasket: a mechanical seal which fills the space between two or more mating surfaces, generally to prevent leakage from or into the joined objects while under compression.</p><p><br /></p><p>The constraining ring is generally not under &quot;compression&quot;, possibly having a &quot;tang&quot; on outer diameter to restrict rotation, while the inside diameter provides friction on the irregular outside diameter of a coin </p><p><br /></p><p>JMHO[/QUOTE]</p><p><br /></p>

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