Abstract: The present invention provides an apparatus for sealing a portion of a fluid vessel. The apparatus includes an inflatable and collapsible enclosed structure constructed and arranged to transition between an inflated configuration and a collapsed configuration when pressurized fluid is received therein and released therefrom, respectively. The apparatus includes at least one annular seal member protruding from an outer surface of the enclosed structure, wherein the annular seal member is constructed and arranged to engage an inner surface of the fluid vessel to form a fluid tight seal between the inner surface and the outer surface of the enclosed structure when the enclosed structure is disposed therein and pressurized to substantially the inflated configuration.

Abstract: A stackable portable container assembly for storing fluid having a pallet base and a tank having top, middle and bottom portions. The top portion can be integral with the tank or removable from the middle portion. A plurality of cables removably secure the tank to the pallet base. The bottom portion and an upper surface of the pallet base comprise cooperating male and female receptacles which are adopted to cooperate with each other when the tank is mounted to the pallet base. The bottom portion further comprises at least one drain. A drain valve coupled to the drain of the tank to enable the fluid stored in the tank to be removed at a predetermined rate. A lever-operated drain stopper is optionally disposed in the tank to prevent the fluid from flowing through the drain opening.