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233 Buna-N O-Ring, 70A Durometer, Black, 2-7/8" ID, 3-1/8" OD, 1/8" Width (Pack of 10): O Ring Seals: Amazon.com: Industrial & Scientific
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M3.5x100 Viton O-Ring, 75A Durometer, Round, Black, Viton, 100 mm ID, 107 mm OD, 3.5 mm Width: Amazon.com: Industrial & Scientific
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