Z-FLEX 4" x 18 Ft. Insul-Vent Double Wall Insulated Vent Connector Kit

4" x 18 Ft. Insul-Vent Double Wall Insulated Vent Connector Kit Insul-Vent is a double-wall insulated vent connector. Insul-Vent is designed to make insulated connections between appliance and common vent (i.e. B-Vent, masonry chimney, or Z-FLEX chimney liner products), easy and economical. Simply cut to desired length and attach quick-connect ends. No drilling or screwing is required. Plus it eliminates costly elbows and accessories.