These portable fuel tanks are manufactured from high-density multi-layer polyethylene with ultraviolet inhibitors. Advanced manufacturing techniques provide the highest quality product components available and meet the new low permeation standards put inplace by the EPA/CARB regulations effective 1/1/2011. Portable tanks 12 gallon and under meet current United States Coast Guard, and ABYC Standards. All Moeller portable fuel tanks include the new EPA compliant 2-stage "Click when closed" fuel cap, required after 1-1-2011.