CORROSION RESISTANT and RUST-FREE FOR MARINE APPLICATIONS! Because it is highly resistant to rust and saltwater corrosion, this is the best tank for boats, yachts, and marine use; bigger tanks are available - 10 lbs, 20 lbs, 30lb, and 40 lbs CONSTRUCTED FROM HIGH-GRADE ALUMINUM: This tank has a bright and shiny smooth finish and clean, dry, and flake-resistant interiors; great for Marine applications LIGHTWEIGHT FOR EASIER LIFTING - More propane gas with a lighter tank for your outdoor activities; great for Marine Applications, Grills and BBQs, Camping, Fishing, & Outdoor Activities; also works with RVs or trailers, propane tank attachable heaters, and other accessories. NEVER RUN OUT OF PROPANE: Our built-in gas meter gauge provides accurate gas level readings so you don’t have to worry about running out of propane! EMPTY TANK: Pre-purged vacuum ready for filling with propane; built from high-grade aluminum construction with long-lasting durability OVERFILL PREVENTION DEVICE: Comes with an OPD valve to prevent overfilling; required by law in most States, if your tank doesn't have this, most places won't fill it! SAFETY: 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