Selkirk Steel Stove Pipe (Pack of 2)The 3 inch x 12 inch EZ adjust pipe is engineered specifically for use with pellet stoves. The adjustable length pipe is designed to slide over another section of pipe eliminating the need to make time consuming cuts. 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: 053713651328