With the actuator attachments VAOM, it is possible to extend stem actuated valves from the series VMEF. If an actuator attachment VAOM is screwed onto the corresponding stem actuated valve from the series VMEF, it creates a roller lever Valve. Roller lever valves can be actuated by a cam from either side, From the left (forwards movement) or from the right (backwards movement). The actuator attachment VAOM can also be used to replace mechanically worn actuators for roller lever valves.