A filling machine assembly (10) for filling a beverage container (12), such as a bottle or can, with a beverage, such as carbonated drinks, juices, or water. The filling machine (10) includes a support housing (14) for supplying the beverage to be discharged into the container (12). A valve housing (22) is mounted to the bottom of the support housing (14) for controlling the discharge of the beverage and a control device (24) is mounted to the top of the support housing (14). A vent tube (30) has a first end disposed within the control device (24) and a second end extending into the valve housing (22). An actuation device (54) moves the vent tube (30) a predetermined stroke between a filling position and a non-use position. The filling machine (10) is characterized by the control device (24) including an adjustment mechanism (80) having a stop block (82) for repositioning the filling position upon movement of the adjustment mechanism (80) thereby adjusting the position of the predetermined stroke. Hence the downward most position of the vent tube (30), i.e., the filling position, may be adjusted without effecting the distance that the vent tube (30) travels between the non-use position and the filling position, i.e., the stroke itself.