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USA SEALING ZUSA-RC-1494 Oil Resistant Buna-N Cord Stock, X-Profile, Nitrile, NBR, 70A, 1/8 in (0.139 in) CS, 5 ft. Long, BlackAmazon$6.49
USA SEALING ZUSA-RC-911 Buna-N Cord Stock, 70A Durometer, Black, Round Profile, 0.093 in Cross Section, 100 ft Long, Buna, Nitrile, NBRAmazon