Balboa G1900 Expander Board / Daughter Board X-P 1-Speed
Balboa expander board / daughter board used to add an additional 1-speed pump (Pump-2) or auxiliary output to compatible Balboa spa control systems such as VS510SZ, EL1000P2, EL2001, and other multi-pump Balboa packs.
It replaces older part numbers 53544 and 53544-01.
