Need to get in compliance quickly? The U.S. Chemical Storage line of basic outdoor chemical storage lockers feature strong construction and standard features like secondary containment sumps, passive ventilation, and grounding rods.. Standard sizes are available in 55-gallon drum capacities of 2,4,6,9, 12 or 16 drums. If additional features or sizes are desired, we create custom solutions every day for customers all over the world. Just reach out to our team! For the basic lockers, ask for Susie. For more customized solutions than those you see here, speak with one of our several Technical Sales Engineers.