This is our new Water Pump for the B,IB,C,CA,RC. early D10 to D15 using the steel pulley. This pump will not work on the later D10-D12 & D15 with cast iron pulley. Unit comes with new pump gasket. Heavier impeller for long lasting service and performance. Also is equipped with the bypass leg if needed. 
NOTE: For late D10/D12 & D15 Tractors using the cast iron pulley, see pump 1600-06.