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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 - 1/4&quot; ID x 1/2&quot; OD x 1/8&quot; Height - Pack of 5

buna-n-u-cup-seal-14-id-x-12-od-x-18-height-pack-of-5

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