Alco FSX-43S Fan speed controller. Fan speed controller (Refrigeration technology / Cooling technical components / Pressure monitoring). Principal data: regulating range 12.4 to 28.4 bar, factory setting 21.8 bar, maximum operating current 4 A, type designation FSX-43S. Supplied under manufacturer part number 715491, HS code 9030.39, country of origin Czechia.