EL850 2-Hole Flange/Taper Shaft, Head Rotatable,Flange Mount, Gear Drive, Side Oil Feed, Thru-Drive Available, Base Oil Drain, Tapered shaft, Service Units are furnished without governors and manifolds and may require head rotation before installation or changeover. Thru-drive units must not exceed 65 ft. of transmitted torque. Service Units require the purchase of thru-drive kit SN3072BW for thru-drive applications. Include installation gaskets. Cummins - Flange Mount Haldex (New and Remanufactured) EL850 2-Hole Flange, Tapered Shaft, Water Or Air Cooled Turbocharged , Installation Instructions For Cummins B&C Series Thru-Drive Conversion - L31078. Installation Instructions For Cummins B Series - L31105. Svc/Repair Instructions For Cylinder Head - L31059. EL850 Compressor