U-Cup
U-Cups (U-Packing or U-Ring) are the most compact and versatile of the many lip type seals available. In its several configurations, it may be utilized as an ID - Rod Seal, or an OD - Piston Seal. U-cups with long thin lips may exhibit very low dynamic friction and can accommodate out-of-round or eccentric components. Shorter, heavy, lips provide a more reliable seal at low pressures and are better suited for sealing at high pressures.
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