The FAMCO WVCA Wall Vent Collar – Aluminum is used with FAMCO Wall Vents as a beauty ring or trim collar to cover the cut-out hole (on the inside wall) and give the installed vent a finished look and the hold around the pipe a more aesthetic appeal. Tightly fitted for security. Quality constructed in .020 gauge Aluminum. The FAMCO WVCA Wall Vent Collar – Aluminum come in sizes 3 inch, 4 inch, 5 inch, 6 inch, 7 inch, 8 inch, 10 inch, and 12 inch. The FAMCO WVCA Wall Vent Collar – Aluminum 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 and variations available, please refer to the FAQs above or feel free to contact us by phone or email.