Equipment Pack - Balboa VS515SZ Control System (#55584) Alternate OEM #55476 Replaces VS501SZ - #54379 Used in, Premium Leisure, Fitness, Mark III, Pinnacle, GO Spas Used with "Standard" Balboa Panels Only Controls the following system options: Pump 1 - Two Speed Auxillary/Air Blower Lighting Package Stereo Package Ozone Package Includes 4.0kW Heater