Abstract: Disclosed is a transfer unit for transferring a material within a container, the material being in either powdered or liquid form, to a second container having a diluent therein, to thereby form a solution. The unit includes a container for storing the material, a closure portion including a frangible diaphragm for sealing the container prior to use, the transfer member having dual channels therein, one for the transfer of material from the additive container to the second container, the other for passage of air into the second container. The unit is employed by inserting the transfer member through the closure in the second container, transferring the material within the container to the second container and thereafter removing the transfer unit. In the preferred embodiment, the closure portion and container is removable from the transfer member. The transfer member is therefore retained within the closure of the second container.