wheel worm for center pivot is Commins special-purpose speed reducer, we have made for this products for years. widely used in pivot irrigation for the purpose for crop watering and potato watering.etc.  the wheel drive,wheel worm,wheel gearbox, gearbox reducer for pivot irrigation,irrigation part e is work long life,low noise, high efficiency, with a big torque.  have a big ratio from 1/30  to 1/50 and power from 0.6hp to 1.5hp. welcome your inquiry.