MA5B. Cup plug, part number 3900956. Sold individually.
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MA5B – New Cummins 3900956 steel expansion cup plug, 11/16 in nominal OD, 1/4 in deep, 0.05 in thick, for the cylinder block on Cummins 4B, 6B, ISB, QSB and 3.8L engines. Sold individually. Cross-references PAI 040084 and Interstate-McBee M-3900956. 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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