Superior 12-inch Section Double Wall Pipe - Galvanized P58-1212 inch Section Superior Double Wall Pipe Galvanized P58 12 Product Details This is Superior's 12 inch Section Double Wall Pipe, constructed with galvanized steel and identified as P58 12. Ensure durability and efficient venting for your fireplace system with this high quality component, designed to withstand the demands of your heating needs. Features: 5 Inch Direct Vent Double Wall Pipe For use with Superior or Superior Direct Vent Fireplaces Only