Z-Flex Stainless Steel 4" to 5" Pipe Diameter Increaser (not eccentric)Used to upsize a vent system. Recommended for use with vertical vent run applications. Features• Vent material: AL29-4C stainless steel DownloadsZ-Vent SVE Series IV Installation and Maintenance Instructions, 3" to 24", Single & Double Wall Z-Vent Dimensional Specifications |