For shipping bulk liquid. Used primarily for shipping asphalt cement aboard sea-going vessels. Has insulation capable of maintaining the asphalt in a liquid state for several days without additional heat. Optional versions have provisions for heating. One version has a heating coil through which hot oil can be pumped to restore heat. Another version has a fire tube and mounting inlet for a burner. Has a capacity of 5,200 U.S. gallons (19,683 liters).