Pallet Rack Sump   This polyethylene pallet rack containment sump keeps dangerous and costly spills off the floors, equipment and inventory. Allows direct forklift access to wooden pallet-sump unit stays positioned in the rack when removing pallet and drums. Low profile design fits into warehouse racking with minimal obstruction to adjacent storage area. Unit holds up to (4) 55-gallon drums on a standard shipping pallet. Inside dimensions for a pallet are 49" x 49". Model PRS-51-D comes with drain/ball valve assembly for draining liquids.  Specs: Description No Drain, Overall Size 51 1/2" x 51 1/2" x 12", Uniform Containment  Capacity 66 GAL. and Net WT. 50.