A mounting mechanism is provided for mounting a second SCUBA tank (e.g. a pony tank) to a first SCUBA tank (e.g. a main SCUBA tank). The mounting mechanism includes a bracket having a first curved outer surface for engaging the first SCUBA tank, having a second curved outer surface for engaging a second SCUBA tank, and having a connecting portion connecting the first curved outer surface to the second curved outer surface, a passage being formed in the connecting portion. A first clamp extends through the passage in the connecting portion and secures the second SCUBA tank to the second curved outer surface. A second clamp, for example the existing BCD strap of a main SCUBA tank, extends through the passage in the connecting portion and secures the second SCUBA tank to the first curved outer surface.