An animal cage system comprises at least one cage , the at least one cage comprising a cage top , said cage top including one or more walls extending from a ceiling , a cage base , said cage base including one or more walls extending from a floor , the ceiling being substantially flat, the ceiling of the cage top including one or more openings, the one or more openings being covered respectively by one or more filters, one or more water housing mount pockets formed in the ceiling , the water housing mount pocket including a conical support; a rack for supporting the at least one cage, wherein the conical support includes a bottom end, a lower end and an upper end, the lower end extending to the bottom end, a conical section being positioned at the lower end to extend between bottom end and upper end; and wherein the cage base and the cage top are snap fit together, and the rack includes a suspended runner system for automatically locking the cage base and the cage top together when the cage top and cage base are inserted into the rack, characterized in that the animal cage system further comprises: a structure including a front section and a rear section , the structure being configured to be received under said cage top, the front section being positioned below said water housing mount pocket and the rear section being positioned below the one or more openings, a middle section joining the front section to the rear section , the middle section extending downwardly, the rear section extending into the cage top and the front section and a part of the middle section extending into the cage base. at least one cage , the at least one cage comprising a cage top , said cage top including one or more walls extending from a ceiling , a cage base , said cage base including one or more walls extending from a floor , the ceiling being substantially flat, the ceiling of the cage top including one or more openings, the one or more openings being covered respectively by one or more filters, one or more water housing mount pockets formed in the ceiling , the water housing mount pocket including a conical support; a rack for supporting the at least one cage, wherein the conical support includes a bottom end, a lower end and an upper end, the lower end extending to the bottom end, a conical section being positioned at the lower end to extend between bottom end and upper end; and wherein the cage base and the cage top are snap fit together, and the rack includes a suspended runner system for automatically locking the cage base and the cage top together when the cage top and cage base are inserted into the rack, characterized in that the animal cage system further comprises: a structure including a front section and a rear section , the structure being configured to be received under said cage top, the front section being positioned below said water housing mount pocket and the rear section being positioned below the one or more openings, a middle section joining the front section to the rear section , the middle section extending downwardly, the rear section extending into the cage top and the front section and a part of the middle section extending into the cage base. <EOS>