Automatic Control Unit, 3HP, Surf, to fit A-dec® Cascade® The Arm-Mounted Automatic Control Unit features a new, simplified design with straightforward internals such as a single diaphragm control block without any moving pistons, springs, or O-rings and a simple combination valve for water flow control. This unit is a direct replacement for A-dec® Cascade® models. Quick install that takes less than an hour Replacement for A-dec® Cascade® 12 ft. color matched internal umbilical Color matched to original A-dec® Surf Individual Non-retracting Water Coolant Includes Precision Comfort® Syringe