Compare Quick view Balboa Water Group Balboa Water Group | PCB | 1-SPEED EXPANDER BOARD VS510SZ | 53544 MSRP: Was: Now: $35.89 Balboa Water Group | PCB | 1-SPEED EXPANDER BOARD VS510SZ | 53544 This board can be used with #3-60-0071 PCB: EL2001 when operating 3 pieces of equipment:2 -2 Speed Pumps & 1 Blower Brand name : Balboa Water Group Add to Cart Add to Cart