For O-ring we have terms and definitions in 9 topics. The topics are Adhesives and Sealants, Beer Brewing, Body Modification, Body Piercing, Paintball, Plumbing, Remote Control Cars, Slot Car Drag Racing and Watches.

A circular piece of rubber which fits around the piston to help maintain the seal between the piston and cartridge wall.
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A circular gasket, usually made of rubber. O-rings come in different shapes and sizes. On soda kegs, they are used to ensure a gas-tight seal on the main lid, the liquid and gas fittings, and between the dip tubes and the keg body. O-rings will eventually deteriorate, and must be replaced occasionally.
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A rubber ring used on retainers and beadless jewelry such as plugs or fleshtunnels, to hold the jewelry in place by surrounding it (with one on each side of the jewelry) so that it cannot fall out.
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A thin, rubber ring that fits snugly on the end of a plug to keep it in place in your piercing.
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Rubber gaskets use in your gun.
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Round rubber washer used to create a watertight seal, chiefly around valve stems
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A donut-shaped circle of rubber or silicone that seals rotating or sliding shafts, used in areas like shock absorbers and differentials.
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Generic industrial rubber or elastomeric rings used as front and wheelie-bar tires
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O rings are used to seal the backs of watches which feature either a press-in back or a screw on back. They ensure water resistance. Usually also used on the winding stems of watches and in the winding crowns to protect against the ingestion of water and dust. Normally made from a rubber/plastic compound.
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