This Maytronics Dolphin™ 9995359RD-EX Black 6 Hour Diagnostic 3001 Motor Unit Assembly for Dolphin™ 3001 and Caddy Red and Yellow, 3001 and Caddy Blue, and 3001 115V CB BL 2013 is a reliable replacement part, designed to seamlessly intergrate with the original pool cleaning system. The motor unit is an important driving factor in 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.