Stack up to 9 units to guarantee lowest delivered cost on multiple unit orders, Meets / Exceeds all N.A. Environmental Regulations, Strong removable Platform, Low profile design for ease of use, "Unique spill containment sump design allows for efficient ‘stacking or nesting' that provides for efficient,low cost storage,handling and transportation. Low profile sump design with strong removable platform for ease of use. ", ORDER ONLINE HERE,