Industry-first steel-aluminum combo weighs less than full-steel models. Unique, smooth finish offers a sleek look compared to diamond plate. Heavy-duty 14-gauge steel tank is 100% pressure-tested for safety. Auxiliary transfer fuel tank: It is the user's responsibility to comply with local, state and federal requirements pertaining to safe transportation, loading and discharging of tank contents. Not for use with gasoline. Cannot be used to transfer gasoline to another vehicle. Transfers diesel or other non-flammable liquids to on-site vehicles or equipment. Patented Rigid Core foam-filled lid to maximize strength and prevent binding. Built-in tool box provides added storage without reducing truck bed space. Lockable, commercial-grade vented cap with reinforced collar for added security. Built-in drain plug for easy and complete emptying as needed.