Camco's Marine Holding Tank Vent Filter Kit helps stop odors from escaping from your boat's holding tank vents. Featuring granular activated carbon (GAC), the provided filter removes odorous gases for maximum odor control. Product installs easily to your boat's vent hose. The vent filter kit comes with a filter, a mounting bracket (12 1/8-inches (L) x 2 ¾-inches (D) x 2 ¾-inches) and fittings for easy installation. The fittings are compatible with standard garden hose connections and ¾-inch and 5/8-inch barbed hose connections. Depending on the usage, the filter will last an entire boating season, or more.