The Duravent 3BVSC is a Type B Vent Storm Collar 3" from the Duravent Type B Gas Vent line, 3 inch diameter. Storm collar that sits above the roof flashing and sheds water away from the pipe. Seal the top edge to the pipe with high temperature silicone.
Type B gas vent is the double wall aluminum inner, galvanized outer vent used on natural draft gas appliances such as water heaters, furnaces, and gas stoves. Every Type B Gas Vent component is listed as part of the system, so use matching Type B Gas Vent parts throughout the run to keep the listing and the clearances valid. Check the appliance manual for the vent size and type it requires before ordering.
Rural Energy stocks the full Duravent Type B Gas Vent line, along with the stoves and heaters it vents, and ships to dealers, contractors, and homeowners.