Increaser 4" x 6 5/8" to 5" x 8" [Galvanized], DirectVent - 46DVA-X58 Duravent MSRP: $83.74 46DVA-X58 is a galvanized 4 inch by 6-5/8 inch to 5 inch by 8 inch increaser. This is used with DirectVent pipe and is an OEM DuraVent venting component.
