MA5B. Cup plug, part number 3900965. Sold individually.
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MA5B – New steel cup plug, 2-1/4 in nominal OD, 5/16 in deep, 0.06 in thick, for the cylinder block on Cummins 4B, 6B, ISB and QSB engines and the cylinder head on 6C / ISC / ISL engines. Sold individually. Cross-references Cummins 3900965, 3922072, 3812090, 3975796 and 4938189, and PAI 040093. Photo shows the equivalent part.
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Products explicitly described as “Genuine OEM” are genuine original equipment manufacturer parts. Other references to OEM names, part numbers, or model numbers are provided to identify compatibility and do not imply that a product is OEM.
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