33-0029B HydroQuip | Circuit Board, Expander, HydroQuip (Balboa), VS510SZ, 1Speed-Pump2 $42.44 Board Model - VS510SZ
33-0029A HydroQuip | Circuit Board, HydroQuip (Balboa), Expander Board Kit, VS513Z (1-Speed Pump) w/30 Amp Fuse $60.73 Board Model - VS513Z
33-0029 HydroQuip | Circuit Board, VS/EL Expander Board, Dual Relay $73.18 Board Model - VS/EL Expander Board