Honeywell L4006A1959 Aquastat 40/180F, 5F Differential, 1.5" Insulated OEM

OEM Honeywell Aquastat L4006A1959 for boiler temperature control. Settings span 40 to 180F with a fixed 5F differential, and the unit includes a 1.5" insulated sensor assembly. Designed as a direct replacement for factory-installed aquastat controls in hydronic heating systems—same OEM part number L4006A1959.