The FAMCO Stainless Steel Globe Vent GVBSS is an economical, gravity ventilator for use on residential, commercial and industrial applications. The GBVSS features water tight construction and a low silhouette while offering positive draft for good air flow. The draw bolt collar (available in sizes up to 12”) offers secure fit yet is easily removed when needed. This product is constructed in 26 gauge Stainless Steel. Note: This product uses the FAMCO FB, SB PB - Vent Base on certain applications.