This wheel assembly is important to ensure full range of motion in the pool cleaner. Maytronics Dolphin™ 9995558 Wave Long Shaft Wheel Assembly is a reliable replacement part, designed to seamlessly intergrate with the original pool cleaning system. The wheel assembly helps ensure 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.