CORROSION-RESISTANT and RUST-FREE! Because it is highly resistant to rust and saltwater corrosion, this is the best tank for boats, yachts, and any marine use. The Flame King 20LB Aluminum Propane Tank arrives EMPTY, pre-purged, and vacuum sealed, ready for filling with propane, avoiding the cost and headache of purging your new tank. Built from high-grade aluminum, this tank has a bright and shiny smooth finish and clean, dry, and flake-resistant interiors. Tank is lightweight for easier lifting - more propane gas with a lighter tank for your outdoor activities! Ideal for outdoor cooking, grills and BBQs, camping, and fishing. Also works with RVs or trailers, propane tank attachable heaters, and other propane appliances. For your safety, this tank comes with an OPD valve to prevent overfilling. It also comes with a built-in gauge, so you don’t have to worry about running out of propane! The built-in gas meter gauge provides accurate gas level readings. X-Ray and Hydrostatic Tested and DOT (Department of Transportation) and TC (Transport Canada) Certified so you can be sure to transport safely both in the US and CA.