2SVEPWCF03 Commercial Single Wall Pipe Z-Vent Commercial Single Wall Pipe Gasketed Connections Fusion Welded Pipe Seams No Sealant Required, No Cure Time, or No Call Backs Air Tight Seam, Smooth Finish, Better Fit Metallic Special Gas Vent Cut to Length On Site (Single Wall Version) Saves Time and Lowers Cost. Highest Pressure Rating in the Industry Greater Than Five Time the Industry Standard Single and Double Wall, Manufactured in Diameters from 3" to 24" Available in 3" Through 24" Diameters and Various Lengths up to 10 Feet. Features and Benefits Z-Vent is a Factory Built, Engineered AL29-4C Special Gas Vent Pipe, Suitable for Positive or Negative Pressure. Z-Vent is UL Tested and Listed to UL1738/S636. CAT II, III, IV Venting Approved. Z-Vent Special Gas Vent for Category Il, Il, IV Heating Equipment Is Designed for Use with Boilers, High Efficiency Furnaces, Pool Heaters, Unit Heaters and Tankless Water Heaters. Z-Vent is Manufactured Using AL29-4C, Advanced Ferritic Stainless Steel with Unmatched Corrosion Resistance, for Use with Condensing Furnaces and Boilers.