Napoleon 5"/8" Direct Vent Flex Vent Components - 5" Coupler The Napoleon 5"/8" Direct Vent Flex Vent Components - 5" Coupler is a specialized part designed to connect two sections of Napoleon's 5"/8" Direct Vent Flex Vent. It is used to ventilate exhaust from a Napoleon appliance, such as a fireplace or wood stove, while providing the necessary air supply. This coupler is made of heavy-duty aluminum and features a durable black powder-coated finish. The two 5" sections can be connected using the 5" Coupler to form one continuous vent system. The Napoleon 5"/8" Direct Vent Flex Vent Components - 5" Coupler is designed for use with Napoleon's 5"/8" Direct Vent Flex Vent components and is UL listed for safety. It is ideal for use in residential and commercial settings. Features 5" Coupler - W175-0166 Specification Warranty : 2 Year Limited