Pos-T-Vac PTV Manual 3000 (MOS) System - Manual Pump for ED Treatment The Pos-T-Vac PTV Manual 3000 (MOS), is a manually-operated penis pump system designed with intimacy in mind. This innovative vacuum therapy system produces lasting results in a short time. The simple design of this pump head allows the user to activate the pump with minimal effort. Featuring the PTV Manual 3000 (MOS), which is spring loaded so the vacuum is activated by simply pressing down on the pump head in a repeated motion, the PTV Manual 3000 (MOS) can be a very comfortable system to use because the user can easily control the speed at which the vacuum is created.