The Chelsea 4P165 is a driveshaft spacer designed for use in Chelsea PTO driveline applications. Driveshaft spacers are precision-fit components that maintain correct shaft positioning and alignment within the PTO assembly, making exact part identification critical before ordering. The 4P165 part number is the definitive identifier for this spacer. Pro Gear and Transmission carries genuine Chelsea PTO parts. Not certain this is the correct spacer for your setup? Give us a call and we can help confirm fit for your specific application.FeaturesGenuine Chelsea driveshaft spacerPart number: 4P165Designed for Chelsea PTO driveline applicationsCritical fit component – confirm part number against your assembly before orderingAvailable from Pro Gear and TransmissionUsed in these Chelsea PTO models442 Series447 Series489 Series