The Chelsea 5P1189 is a genuine Chelsea adapter gear designed for use with Chelsea power takeoff systems. Adapter gears serve as the interface between the PTO and the driven component, making the correct part number critical to proper engagement and fit. Chelsea has long been a standard in commercial truck PTO applications, and OEM components like the 5P1189 are built to the original specifications of the Chelsea line. If you need to verify this gear fits your specific PTO model or truck configuration, call Pro Gear and Transmission and we will help you confirm the right part.FeaturesGenuine Chelsea OEM adapter gearPart number 5P1189Designed for Chelsea power takeoff (PTO) systemsCritical interface component for PTO-to-driven-equipment connectionCall Pro Gear and Transmission to confirm fitment for your specific PTO modelUsed in these Chelsea PTO models236 Series442 Series447 Series626 Series628 Series645 Series