An apparatus for applying a liquid product to a workpiece includes a pump piston and cylinder unit for pumping the product through a valved outlet orifice, displacement of the piston being adjustable for controlling the amount of product dispensed, the piston being pneumatically operated, and a rotatable turret being mounted on the unit and having a plurality of seats for holding workpieces of different sizes. Liquid product passageways extend from the seats toward the outlet orifice, and one of such passage ways communicates with the orifice in a selected rotative position of the turret.