Old rusty oil barrel isolated for illustrators such as those in graphic design. Image can be used in a variety of concepts for energy, going green, use of natural resources, oil spill, alternative energy, power, fossil fuel, gas, gasoline, oil economy, etc. The typical 55 gallon drum. Barrels such as this are used to burn garbage in rural areas which adds to pollution. Isolated graphic. Dripping and leaking oil adds visual meaning.