Do you need to experiment with a penis pump, comfortably and safely? If sure – the Hydromax 3 by Bathmate is good for you! The penis pump ensures a more durable erection and extra quantity throughout and after pumping. How does it work? Fill the pump with water and place it on the penis. Press the bottom of the pump to your physique. to permit the water to squirt our of the pump to pump up the penis. The Bathmate 3 is appropriate for males with a erect penis size of 14.5 cm.