Camco's Marine Holding Tank Vent Filter Kit helps eliminate odors that are released from your boat's holding tank vent. It features granular activated carbon (GAC) for maximum odor control. This allows odorous gases to be properly filtered, helping absorb any holding tank smells. Kit installs easily to your boat's vent hose. Product includes a filter, mounting bracket and fittings for standard garden hose connections, ¾-inch and 5/8-inch barbed hose connections. The mounting bracket measures 12 1/8-inches (L) x 2 ¾-inches (D) x 2 ¾-inches. The filter will last an entire boating season or more, depending on the usage.