Honeywell High Limit Aquastat Controller W/ 54" CapillaryHigh Limit Aquastat Controller with 100 F to 180 F operating temperature, 5 F fixed Differential and 54" capillary. Product Specifications BRANDHoneywell DIAMETER INCHES3/8 CAPILLARY LENGTH INCHES54 INSULATION DEPTH INCHES2-1/4 Controller, 2-1/2 Remote TEMPERATURE CONTROL RANGE °F100 to 180 SWITCH TYPESPST, contacts break on temperature rise APPLICATIONHigh Limit DESCRIPTIONHigh Limit Aquastat Controller LIMITED WARRANTY YEARS1 MANUFACTURER'S PART NUMBERL8100B1094