Dometic Sealand Eco Holding Tank Vent Filter Cartridge with Adapters Sierra Marine 309311004 Waste Holding Tank Vent Filter Eliminates Odor Coming From Holding Tank Dometic 309310002 RV Sealand Holding Tank Vent Filter Holding tank vent filter SPINNAKER NUTICA VALENCIA DOMETIC SEALAND TANK, VENT, FILTER 1 YACHTSERVICES. Waste Holding Tank Vent Filter Eliminates Odor Coming From Holding Tank SIERRA MARINE 309311004 The vent filter absorbs holding tank vent odors and keeps the surrounding air clean and pleasant. The vent filter eliminates the need for any holding tank chemicals. Attributes Compatibility: 5 8 Inch 3 4 Inch 1 Inch Inside Diameter Hose Fittings Used For: Eliminates Odor Coming From Holding Tank Diameter: 3 1 8 Inch Length: 15 Inch Element Material: Plastic Housing Material: Plastic With Fittings: Yes Features & Benefits Dispels The Need To Use Harmful Chemicals Most Effective Odor Absorbing Filter Material Used Fresh And Clean Air The Environmentally Friendly Way Easy To Use Limited 1 Year Warranty