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U-cups have a sealing lip on both the inside and outside edges so that they can be used for rod and piston sealing.

Buna-N U-Cup Seal - 3/8&quot; ID x 5/8&quot; OD x 1/8&quot; Height - Pack of 5

buna-n-u-cup-seal-38-id-x-58-od-x-18-height-pack-of-5

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