The 3,200-gal.-capacity Durasucker meets U.S. DOT specification 412 for hauling hazardous materials on highways. Built and certified in conformance with Section VIII of the American Society of Mechanical Engineers pressure vessel code, the unit's 72-in. carbon-steel cargo tank has a maximum allowable working pressure of 35 psig internal and 15 psig external (full vacuum). Super Products LLC,