Selkirk 3 in. x 3 in. x 3 in. Aluminum/Galvanized Steel Vent Tee with Cap (Pack of 2)The 3 inch VP tee with tee cap is used to transition from horizontal to vertical orientation piping. The tee cap provides easy access for inspection and maintenance. Engineered specifically for use with pellet stoves, the double wall is designed with an internal spacing bead to assure 1 4 inch uniform insulating airspace between the pipe walls making Selkirk the most safe, efficient and cost effective venting system on the market. UPC: 053713651335