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Find out why customers are loving the Big Boss Tuner!
Available for all Cummins X15 and ISX Engines
PDI’s BIG BOSS® Aluminum Fill Tube and Cap design eliminates the hassle of trying to pour oil over the top of your power-steering reservoir. The longer fill neck design brings height up to a higher and more visible location. Coupled with our billet designed cap, you will no longer rely on a plastic cap!
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