A device for storing and dispensing reagent components for an automated clinical analyzer, the device comprising: a reagent dispensing cap comprising: a cylindrical housing having a long axis and comprising a first end and an adjacent first opening and a second end and an adjacent second opening, the cylindrical housing defining a chamber comprised of a lumen positioned between the first end and the second end, the cylindrical housing comprising internal threads extending along an internal surface of the cylindrical housing from the first end to the second end of the cylindrical housing; a cylindrical member comprising a first end and a second end, the first end being positioned at the first end of the cylindrical housing, the cylindrical member comprising external threads for mating with at least the internal threads of the cylindrical housing, the cylindrical member being rotatable on or around the internal threads of the cylindrical housing and being translatable from the first end of the cylindrical housing towards the second end of the cylindrical housing, wherein mating of the external threads of the cylindrical member with the internal threads of the cylindrical housing prevents exposure of a first reagent in the reagent dispensing cap to moisture or oxygen; a seal positioned across the lumen of the chamber at the second end of the cylindrical housing, wherein the chamber of the cylindrical housing is bounded between the second end of the cylindrical member and the seal, wherein the seal is integral with and joined to the second end of the cylindrical housing; and an attachment device at the second end of the cylindrical housing for mating the reagent dispensing cap to a container. a cylindrical housing having a long axis and comprising a first end and an adjacent first opening and a second end and an adjacent second opening, the cylindrical housing defining a chamber comprised of a lumen positioned between the first end and the second end, the cylindrical housing comprising internal threads extending along an internal surface of the cylindrical housing from the first end to the second end of the cylindrical housing; a cylindrical member comprising a first end and a second end, the first end being positioned at the first end of the cylindrical housing, the cylindrical member comprising external threads for mating with at least the internal threads of the cylindrical housing, the cylindrical member being rotatable on or around the internal threads of the cylindrical housing and being translatable from the first end of the cylindrical housing towards the second end of the cylindrical housing, wherein mating of the external threads of the cylindrical member with the internal threads of the cylindrical housing prevents exposure of a first reagent in the reagent dispensing cap to moisture or oxygen; a seal positioned across the lumen of the chamber at the second end of the cylindrical housing, wherein the chamber of the cylindrical housing is bounded between the second end of the cylindrical member and the seal, wherein the seal is integral with and joined to the second end of the cylindrical housing; and an attachment device at the second end of the cylindrical housing for mating the reagent dispensing cap to a container.