DuraVent FasNSeal Flex Coupler: joins two chimney liner lengths end to end
The DuraVent FasNSeal Flex Coupler is a stainless steel connector that joins two lengths of FasNSeal Flex liner end to end. FasNSeal Flex is DuraVent’s flexible stainless steel liner that carries a high efficiency gas appliance’s exhaust up through an existing masonry chimney. The liner is for homes where a side wall exit is not possible and the chimney route has bends. It follows those bends, while its smooth inside surface helps exhaust flow and liquid condensate drain. The liner works only with FasNSeal parts.
Choose a coupler to match your liner: 2, 3, 4, 5, 6, 7, 8, 10, or 12 inch. For planning, liner sizes from 2 to 8 inch come in 20, 25, 30, 35, or 50 feet, except 7 inch stops at 35 feet. The 10 and 12 inch liners come in 10 feet. Custom lengths are no longer offered, but the liner can be shortened with a straight cut across it. DuraVent does not publish fitting instructions for this coupler. Need the liner too? See the DuraVent FasNSeal Flex liner. The DuraVent FasNSeal Flex Coupler ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.








Commercial projects may require custom parts and unique system designs. Duravent offers complete project assistance:








































