Get your semi Ready for the Road Ahead™ with enhanced power for auxiliary applications, with the Chelsea 489 Series 8-Bolt 21/37 Standard Mount Power Take-Off. By connecting to the transmission, this replacement PTO is able to convert the rotational energy into usable power for auxiliary devices. Manufactured with top-tier components to provide long-term dependability for semis, tractors, and hydraulic engagements. FleetPride is your First Click in Heavy Duty®.