means 78 extending therethrough which is in aligning registration with respect to the first locking ear aperture 70 and the second locking ear aperture 72 in such a manner as to be adapted to receive the pivot axle 82 positioned extending therethrough responsive to positioning simultaneously through the first locking ear aperture 70 and the second locking ear aperture 72 pivot member 74 is also configured in such a manner as to define a pivot member slot 76 therein in full fluid flow communication with respect to the pivot channel means 78 the pivot member 74 will also preferably be pivotally movable about the pivot axle 82 between a locked position 100 and an unlocked position 102 in the locked position 100 the pivot member 74 will be adapted to extend into the interior chamber means 24 and in the unlocked position 102 pivot member 74 will be removed therefrom preferably pivot member 74 will include a pivot member protruding second 75 which is movable through the locking frame aperture 56 in order to extend into the interior chamber means 24 for locking a tank 94 in the interior chamber means 24 responsive to movement of the pivot member 74 to locked position 100 the pivot member protruding section 75 also is movable to a position removed from and exterior with respect to the interior chamber means 24 responsive to movement of the pivot member 74 to the unlocked position 102 to facilitate movement of a tank 94 through the access opening 12 for placement and removal with respect to the interior chamber means 24 in the preferred configuration of the present invention the resilient biasing means 80 will comprise a coil spring which is positioned extending around the pivot axle 82 within the pivot chamber means 78 and.