A universal closure valve adapter attachable to a neck wall of a first container that forms a periphery of an opening having a diameter, the universal closure valve adapter comprises: a closure valve assembly that includes a valve member biased to a closed position, wherein the closure valve assembly is attachable to a closure valve assembly of a second container , wherein the closure valve assembly of the second container is configured to open the valve member of the closure valve assembly of the first container to form a closed-loop fluid transfer system between the first and second containers; a flange transversely extending from the closure valve assembly of the first container ; wherein the flange includes a plurality of tank neck engagement assemblies ; wherein each of the plurality of tank neck engagement assemblies is spaced apart from each other about the flange; wherein each of the plurality of tank neck engagement assemblies includes a swivel member and an elongated retaining member rotatably disposed through the swivel member and having a tip; wherein the swivel member of each of the plurality of tank neck engagement assemblies is pivotable with respect to the flange; wherein each of the elongated retaining members are movable through its corresponding swivel member through which the elongated retaining member is disposed such that the tip of the each of the elongated retaining members is movable toward and away from the neck wall that forms the periphery of the opening having a diameter; wherein the tip of the each of the elongated retaining members is movable so the tip of the each of the elongated retaining members engages the neck wall that forms the periphery of the opening having a diameter and secures the flange to the neck wall that forms the periphery of the opening having a diameter; and wherein the closure valve assembly is positioned in fluid communication with the opening having a diameter. a closure valve assembly that includes a valve member biased to a closed position, wherein the closure valve assembly is attachable to a closure valve assembly of a second container , wherein the closure valve assembly of the second container is configured to open the valve member of the closure valve assembly of the first container to form a closed-loop fluid transfer system between the first and second containers; a flange transversely extending from the closure valve assembly of the first container ; wherein the flange includes a plurality of tank neck engagement assemblies ; wherein each of the plurality of tank neck engagement assemblies is spaced apart from each other about the flange; wherein each of the plurality of tank neck engagement assemblies includes a swivel member and an elongated retaining member rotatably disposed through the swivel member and having a tip; wherein the swivel member of each of the plurality of tank neck engagement assemblies is pivotable with respect to the flange; wherein each of the elongated retaining members are movable through its corresponding swivel member through which the elongated retaining member is disposed such that the tip of the each of the elongated retaining members is movable toward and away from the neck wall that forms the periphery of the opening having a diameter; wherein the tip of the each of the elongated retaining members is movable so the tip of the each of the elongated retaining members engages the neck wall that forms the periphery of the opening having a diameter and secures the flange to the neck wall that forms the periphery of the opening having a diameter; and wherein the closure valve assembly is positioned in fluid communication with the opening having a diameter. <EOS>