Bathmate The worlds first hydrotherapy pump.Use Bathmate in a warm bath and place over the penis. By pulling it towards the body, a tight seal is created, and the seal then forms a tight vacuum, so that the water is expelled from the tube and a larger than normal erection is created. To release the vacuum the button at the top of the flask is pressed and the unit is removed easily from the penis.Gain up to 4 inches length, 30% girth, 40% volume, stronger orgasms and harder erections.