The FAMCO SB Round Vent Base – Saddle. Used with a Globe Vent or any other round based roof vents without a flange. The Saddle Base SB is made for installation on the ridge or peak of the roof, straddling the peak of the roof. This product features a large flange for easy installation and leak protection. No field trimming required. Weather proof construction. Crimped for top for chimney cap or roof vent. Quality constructed in 28-24 gauge Galvanized steel. The FAMCO SB Round Vent Base – Saddle comes in a range of sizes with diameters: 4 inch, 6 inch, 8 inch, 10 inch, 12 inch, 14 inch, 16 inch, 18 inch, 20 inch, 22 inch, and 24 inch. When ordering the pitched based models, be sure to select the correct pitch/slope option for the specific roof to be installed on. This is a custom product built to your selection of diameter and pitch/slope. The FAMCO SB Round Vent Base – Saddle is manufactured by FAMCO in the United States and comes with a 1-year warranty against product defects and workmanship. If you have any questions about this product, please refer to the FAQs above or feel free to contact us by phone or email.