Overview Reviews Similar Products Product Description Sundance Spas 600/650 Circuit Board. Replaces 6600-033 PWA: 1995-5/97, 600, 650 System (2-Pump) OEM Code 6600-053 G6406 Product Videos Custom Field Product Reviews Find Similar Products by Category Recommended Quick view Sundance Spas 600/650 Circuit Board. Replaces 6600-043 & 6600-055 (1 pump) $899.25 $0.00 Quick view Sundance 400-600 series circuit board - 6600-032 $771.63 $462.95 Quick view Sundance Spas 850 Circuit Board. 1999 - 6600-023 $850.00 $559.95