A product may include a storage vessel that may define a first port opening into the storage vessel, and that may define a second port opening into the storage vessel. A first fill conduit may be connected to the storage vessel at the first port. A second fill conduit may be connected to the storage vessel at the second port. A control mechanism may be connected with the first and second fill conduits. A supply conduit may be connected to the control mechanism. The control mechanism may provide a flow path from the supply conduit to at least one of the first or second fill conduits to fill the storage vessel.