Part number: 421001 OE MFG: NAVISTAR OEM Reference: 476521C92 Cross Reference: NAVISTAR : 476521C92, 476521C91, 476521; CATERPILLAR : 0R8170, 1N4215, 1W8495; DETROIT DIESEL : 23500459, R23500459, 23534458, R23534458; FREIGHTLINER TRUCK PARTS : HDXEL13020X; OTHER : R955EL1302X, EL13020, EL13020X, 170.AC13020, 286526, 286526X, 286530, 286530X, 286592, 286592X, 289530, 289350X; VOLVO : MID286526, MID286530, MID286592, MID289530 Product Class: Air Compressors & Parts The PAI 421001 is a compressor identified for the Navistar OEM reference 476521C92. As heavy duty diesel truck parts, compressors generate and maintain pressurized air for systems that depend on controlled air delivery, making the component type part of the truck's air-system operation. Navistar cross-references include 476521C91 and 476521.