Do you want to experiment with a penis pump, comfortably and safely? If yes – the Hydromax 3 by Bathmate is ideal for you! The penis pump ensures a harder erection and more volume during and after pumping. How does it work? Fill the pump with water and place it on the penis. Press the base of the pump to your body. to allow the water to squirt our of the pump to pump up the penis. The Bathmate 3 is suitable for men with a erect penis length of 14.5 cm.