This is a water pump for Allis Chalmers tractors. This is used on tractor models 6060, 6070, 6080, combine models F2 s/n 39201-49600, F3 prior to s/n 49601, K2 s/n 25201-27200, and K3. Replaces part number 74009278. Be sure to add me to your ! Thanks For Your Business!!