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USA Industrials - O-Ring: 42 mm ID x 47 mm OD, 2.5 mm Thick, Viton - 47417860 - MSC Industrial Supply
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uxcell Nitrile Rubber O-Rings, 75mm OD 70mm ID 2.5mm Width, Metric Sealing Gasket, Pack of 10: Amazon.com: Industrial & Scientific
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