This is a crucial maintenance part for big rigs with Cummins ISX or ISM diesel engines. It's the crankcase breather filter element (also called a CCV filter). Its job is to filter the oily vapors coming from the engine's crankcase before they're sent back into the intake or vented out. Over time, this filter gets clogged and needs to be replaced to maintain engine performance and prevent issues. This one is a direct fit replacement for part numbers CV50633, CV50634, 3691476, 904-7904, and many others. It fits a wide range of heavy-duty trucks from Kenworth, Peterbilt, Freightliner, International, Western Star, and more, typically from model years around 2008-2013. Made from quality materials to handle heat and oil. Replacing it is usually a straightforward job. Keep your big diesel running clean and efficient with this essential filter.
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