Replacement Board Assembly 38751 for Pentair Whole House Water Softeners USED

USED Replacement board assembly #38751 compatible with the Pentair Whole House Water Softeners . Compatible replacement for the following water softeners: Pentair Water Softening System (1-2 Bathrooms) Pentair 35920 Pentair Water Softening System (3-4 Bathrooms) Pentair 35921 Pentair Water Softening System (4+) Pentair 35922 This is a tested and working USED circuit board. *May have different settings and parameters then your existing systems.