PDI Billet Oil Fill Cap for Cummins ISX and X15Replacement cap for the PDI Cummins Fill tube Available for: 2010 2019 Cummins ISX12, ISX15, X12, X15 Engines Performance Diesels BIG BOSS Oil Fill Caps are CNC machined from high grade billet aluminum for longevity and superior performance. OEM fill caps are made from inferior plastic which is known to fail and leak oil. Due to vibration and inferior engineering, low quality oil fill caps have been known to come loose and fall off while driving down
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