Metal-Fab Type B-Vent 4" x 12" Adjustable Length Pipe 11.75in Seamless extension tube designed for

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Metal-Fab Type B-Vent 4" x 12" Adjustable Length Pipe 11.75in Seamless extension tube designed forType B Gas Vent products are tested and listed to UL 441 for approved gas appliances and feature our innovative twist lock connection and locking tab, eliminating the need for sheet metal screws. Metal Fab Type B Gas Vent combines hemmed flues and casings that maximize product durability and reliability and minimize installation time. Designed for versatility, Metal Fab Type B Gas Vent products 3" 6" adapt to major competing brands and when installed