Honeywell High Limit Aquastat Controller W/ 39" CapillaryHigh Limit Aquastat Controller with 100 F to 180 F operating temperature, 5 F fixed Differential and 39" capillary. Product Specifications BRANDHoneywell DIAMETER INCHES3/8 CAPILLARY LENGTH INCHES39 INSULATION DEPTH INCHES1-1/2 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 NUMBERL8100B1128