Honeywell Circulator Control Low Limit Aquastat Controller W/ 100 F To 240 FCirculator Control and Low Limit Aquastat Controller with 100 F to 240 F operating temperature, 5 F to 30 F adj. Differential and 66" capillary. Product Specifications BRANDHoneywell LENGTH INCHES2-7/8 DIAMETER INCHES3/8 TEMPERATURE CONTROL RANGE °F100 to 240 SWITCH TYPESPDT APPLICATIONCirculator Control and Low Limit DESCRIPTIONCirculator Control and Low Limit Aquastat Controller LIMITED WARRANTY YEARS1 MANUFACTURER'S PART NUMBERL6008A1192