These modules store drums efficiently, contain spills, and allow safe dispensing of liquids. The base modules with oversized sump hold 110L (30gal.) or 200L (55gal.) drums. Stack modules fit on top of the base modules to double storage capacity, and include nylon strapping for safety. Environmentally friendly black modules are made from 100% recycled polyethylene that resists corrosion and stands up to industrial use. Molded-in lock channels hold drums in place. Dispensing shelf reduces the risk of spills. Modules comply with EPA requirement 40 CFR 264.175, NFPA Code 30, the Uniform Fire Code, OSHA regulations, and SPCC regulations.