Polaris Zodiac 3900 Wheel Sprocket Assembly with Bearing (39-420) darlly this replacement is especially useful

this replacement is especially useful when the wear extends beyond one visible handle or cover piece

making the spa feel easier to use and better maintained overall

A weak or non-operating fan motor can lead to poor heating performance

Designed for 3 inch plumbing winterization applications

Threaded large-face roto scalloped design in gray

Polaris Zodiac 3900 Wheel Sprocket Assembly with Bearing (39-420) darlly this replacement is especially usefulThe wheel sprocket assembly with bearing is part of the Polaris 3900 drive system that helps transfer motion to the cleaner wheels. If the cleaner is slipping, binding, or failing to drive correctly, worn sprocket or bearing components may be involved. This replacement assembly helps restore the mechanical connection needed for smooth wheel operation. It is a valuable part for deeper 3900 cleaner repairs where traction and drive performance need to be