The FAMCO SCB Storm Collar – B Vent is used with the metal pipe flashings. This product is used to divert water from running down the pipe and comes equipped with an adjustable tab. Quality constructed of heavy 26 gauge Galvanized steel. The FAMCO SCB Storm Collar – B Vent is used for a B-Vent, or double wall pipe and has a 5/8 inch to 1 inch oversized opening. Sizes available are 3⅝ inch, 4⅝ inch, 5⅝ inch, 6⅝ inch, 7⅝ inch, 8⅝ inch, 9⅝ inch, 10 inch, 13 inch, 15 inch, 17 inch, and 19 inch. FAMCO SCB Storm Collar – B Vent 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.