A fluidic dispensing device , comprising: a body configured to have a chamber with a perimetrical end surface (150-3), and a stepped arrangement, where the stepped arrangement is configured to include a channel (122-2) having a first inner side wall (122-6) that defines a recessed path around the perimetrical end surface (150-3); and a diaphragm configured to have a dome portion (130-1), a perimetrical positioning rim (131-2) that surrounds the dome portion (130-1); and a sealing surface (131-6), configured that the channel (122-2) is sized and shaped to receive the perimetrical positioning rim (131-2), wherein the first inner side wall (122-6) engages a perimeter of the perimetrical positioning rim (131-2) to position the sealing surface (131-6) for sealing engagement with the perimetrical end surface (150-3) to define a fluid reservoir , wherein the diaphragm is configured to have an exterior perimetrical rim (130-2) that surrounds the dome portion (130-1), characterized in that the exterior perimetrical rim (130-2) is configured to have an inner perimeter (IP1), and the fluidic dispensing device is configured to further comprise: a lid configured to have a recessed region (124-3), an interior positioning lip , and a diaphragm pressing surface , each of which laterally surrounds the recessed region (124-3), the interior positioning lip is configured to be sized and shaped to receive thereover the inner perimeter (IP1) to position the exterior perimetrical rim (130-2) in opposition to the diaphragm pressing surface . a body configured to have a chamber with a perimetrical end surface (150-3), and a stepped arrangement, where the stepped arrangement is configured to include a channel (122-2) having a first inner side wall (122-6) that defines a recessed path around the perimetrical end surface (150-3); and a diaphragm configured to have a dome portion (130-1), a perimetrical positioning rim (131-2) that surrounds the dome portion (130-1); and a sealing surface (131-6), configured that the channel (122-2) is sized and shaped to receive the perimetrical positioning rim (131-2), wherein the first inner side wall (122-6) engages a perimeter of the perimetrical positioning rim (131-2) to position the sealing surface (131-6) for sealing engagement with the perimetrical end surface (150-3) to define a fluid reservoir , wherein the diaphragm is configured to have an exterior perimetrical rim (130-2) that surrounds the dome portion (130-1), characterized in that the exterior perimetrical rim (130-2) is configured to have an inner perimeter (IP1), and the fluidic dispensing device is configured to further comprise: a lid configured to have a recessed region (124-3), an interior positioning lip , and a diaphragm pressing surface , each of which laterally surrounds the recessed region (124-3), the interior positioning lip is configured to be sized and shaped to receive thereover the inner perimeter (IP1) to position the exterior perimetrical rim (130-2) in opposition to the diaphragm pressing surface . a lid configured to have a recessed region (124-3), an interior positioning lip , and a diaphragm pressing surface , each of which laterally surrounds the recessed region (124-3), the interior positioning lip is configured to be sized and shaped to receive thereover the inner perimeter (IP1) to position the exterior perimetrical rim (130-2) in opposition to the diaphragm pressing surface . <EOS>