PRECISION PLANTING MANUAL JD AIR BAG CONTROL KIT PRECISION PART # 725629, THIS ALLOWS YOU TO RUN YOUR PLANTER DOWN PRESSURE AIR BAGS WITHOUT A JOHN DEERE DISPLAY. WAS ON A 2011 1770 PLANTER , PRECISION PART # 725627, HARNESS # 727162-30', HARNESS EXTENSION#727133 *IN SHED*