This Maytronics Dolphin™ 5581014 Stainless Steel Shaft Wheel Assembly for Dolphin™ Pro X2 115V CB, Pro X2 115V CB 2013, and Prox 2 Blue 115V is a reliable replacement part, designed to seamlessly intergrate with the original pool cleaning system. The wheel assembly allows for proper range of motion in the pool cleaner. Maytronics pool cleaners help keep your pool healthy and clean, which is of the utmost importance. Ensure that your pool cleaner is running as cleanly as possible with this certified genuine part.