These 51 1/2" x 51 1/2" x 12" Ultra-Rack Sumps® are polyethylene warehouse rack containment sumps that keep dangerous and costly spills off floors, equipment and inventory. The large, 66-gallon sumps comply with EPA, SPCC and UFC spill regulations. Ultra-Rack Sumps® hold up to four 55-gallon drums on a standard 40" x 48" or 48" x 48" wooden pallet. The space available for the pallet is 49" x 49". The low-profile design fits into warehouse racking with minimal obstruction to adjacent storage areas. These sumps allow direct forklift access to the pallet; the unit stays positioned in the rack when moving the pallet and drums. The all-polyethylene construction is chemical-resistant and won't rust or corrode. Optional 25' drainage hose.