All you have to do to achieve that seal is to place this collar between the vent pipe and the roof flashing. It keeps moisture from seeping in from rain and weather, it's perfectly compatible with other Dura-Vent Type B venting components with a 4 inch inner diameter, and it carries a 25-year warranty. The weather protection your vent system needs is as easy as applying this easy-to-install Dura-Vent Type B Storm Collar.
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