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DuraVent® 4BVL90 Gas Vent Elbow, 4 in, 90 deg, 0.012 in Aluminum Inner and 0.018
DuraVent® Gas Vent Elbow, 4 in Size, 90 deg, 6 x 5-1/2 in Center-to-End, 0.012 in Aluminum Inner and 0.018 in Galvanized Steel Outer, 1000 deg F