SELKIRK CORP 244012 4x12 Pellet Stove Pipe 4" x 12", 4VP-12, Pellet Stove Pipe Type L vent tested and listed to UL-641 and UL-103 standards Use to vent pellet appliances Double wall and insulated design Designed with a stainless steel inner wall and a 0.018 galvalume steel outer wall