The Resideo L4006A1017 Aquastat Controller is a multi functional device that controls temperature in heating systems providing high and low limit control. The aquastat is adjustable in the 5°F to 30°F differential range, to ensure you get the consistent and dependable results you expect. #Resideo #L4006A1017 #AquastatControllerAdjustableDifferential #Resideoparts #PartsHnC #PartsHn... https://www.partshnc.com/l4006a1017-resideo-aquastat100240f-5-30fdifwwel