Abstract: An apparatus for a hair dye applicator is provided which includes a hollow tubular housing with screw-threadably removable caps on both longitudinal ends thereof. One of the caps includes a centrally located outlet through which a hollow stem of an integrally formed nozzle unit is fitted. A manually actuable piston is provided within the tubular housing and includes an actuator member longitudinally slidable along the length of and external to the tubular housing. To ensure that the piston does not axially rotate within the tubular housing during a longitudinal sliding motion thereof, a protruding track is longitudinally provided on the inner wall of the tubular housing and mates with a corresponding recess of the piston. A liner such as a disposable plastic bag is provided within the tubular housing above the piston for receiving a hair dispensable product therein. The screw-threaded end caps confine the contents of the applicator during use thereof.