A secondary containment tub, comprising a lower leak proof compartment having an upper rim and a base and a cover hinged to the upper rim by hinges. A metal collar extends around the upper rim. A flange on the base is provided for securing the lower leak proof compartment to a support. A tank is disposed within the secondary containment tub, with the tank being supported above the base of the lower leak proof compartment, preferably on a metal frame, at a level such that the tank cannot float in fluid spilled from the tank into the lower leak proof compartment.