Dee Zee Combo Tanks - A safe and convenient means for transporting non-flammable liquids. Steel, protected by black NRT (No Rust Tech.) rust inhibitor powder coat finish. Radius curve design eliminates key weld pressure points. Feature stability baffle, lockable cap, 3/8" drainage plug, and venting coupler. Tanks are intended for private use (non-commercial).Not designed for use as an auxiliary fuel system. Not for use with gasoline. Does not meet title 49 of the United Stated Federal Registry.