Use 26-578-1000
ELE09602030 Cal Spa HARWIL Q8DS FLOW SWITCH 25A 8GPM HZN# Q8DS/A/10502.
This product has been discontinued in its original form. You can still order just the flow switch without the electrical plug. This will require the old plug to be spliced into the new flow switch. Please order 26-578-1000, shown in "Related Products" below.