Honeywell Circulator Aquastat Controller W/ 100 F To 240 FCirculator Aquastat Controller with 100 F to 240 F operating temperature, 5 F fixed Differential and 5 1/2 ft. capillary. Product Specifications BRANDHoneywell LENGTH INCHES2-7/8 DIAMETER INCHES3/8 CAPILLARY LENGTH INCHES66 TEMPERATURE CONTROL RANGE °F100 to 240 SWITCH TYPESPST, contacts make on temperature rise APPLICATIONCirculator DESCRIPTIONCirculator Aquastat Controller LIMITED WARRANTY YEARS1 MANUFACTURER'S PART NUMBERL4008B1013