Unique clamshell design features double-walled protection that doesn't require a secondary containment tank Rugged carbon steel construction Ports are provided on both inner and outer tanks for easy access Equipped with emergency vents, a built-in level gauge and leak gauge, 2in. suction tube with cam lock fitting, and locking fill box with integrated filter drain  Protective powder-coat finish looks great and extends durability The 250 Gal. capacity Midwest Industrial Tanks Waste Oil Tank features a unique double-wall clamshell design that meets SPCC regulations, eliminating the need for a secondary containment tank. The 68in.L x 36in.W x 38in.H tank is constructed with a 12ga. carbon steel outer tank that fully contains the entire contents of the 10ga. carbon steel inner tank. UL listed.