As plunger 104 is moved forwardly, the medicament or other fluid contained within chamber 96b of the second vial 96 will flow through passageway 450a of the hollow cannula 450, past check valve 456, into passageway 438, past check valve 62 and finally into reservoir 58 where it will intermix with the diluent or other fluid introduced into the reservoir using the first and second fill means of the