The Flame King 30LB Propane Tank is a pre-purged vacuum ready for filling with propane, avoiding you the cost and headache of purging your new tank. Built from high grade aluminum - corrosion-resistant and rust-free, bright, shiny, smooth finish; clean and dry interiors. Tank is lightweight for easier lifting! More propane gas with lighter tank for your outdoor activities! Ideal for outdoor cooking, grills and BBQs, camping, fishing. Also works with RVs or trailers, propane tank attachable heaters, and other accessories.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 and Transport Canada certified so you can be sure to transport safely both in the US and CA.