Door Seal Caulk - High Temp Black is used to secure replacement fire rope door seals for ALL outdoor boiler model furnaces. This is a 10 oz. cartridge that is used with a standard caulk gun.
Please also purchase one 10ft. length of Fire Rope to complete this periodic maintenance item.
See this link for instructions on how to change the door seal:
How To Change The Door Rope Gasket On Your Outdoor Boiler
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One of the most important steps in prolonging the life of your outdoor boiler is to ensure that the water in your boiler is not corroding the steel. Water starts to eat holes in steel immediately upon contact (through rust corrosion) unless properly treated. We test your outdoor boiler water for free!