A needle-less injector having a housing comprising two or more separate chambers defined within said injector for containing liquid to be injected wherein each chamber comprises 1) a liquid outlet positioned at the front end of the injector； and 2) a dispensing member in contact with the liquid in said chambers and movable in a first direction to reduce the volume of said chamber to cause the liquid contained therein to be expelled through said liquid outlet, wherein the needleless injector further comprising a drive means for actuating said injector, wherein the distance between the liquid outlet for each of said chambers is at least 20 mm.
