Formerly known as the Hercules, the Hydro 7 is our original, best selling penis pump. With its revolutionary design and impressive results, it is no wonder that this pump is used in over 120 countries by thousands of men. If you are looking for an easy to use penis pump that allows for enlarged girth and length, opt for the Hydro 7. This is a great pump for beginners and a safe and convenient way to practice penile rigidity exercises. Whether you need help with erectile dysfunction, more confidence in bed or a bigger penis, the Hydro 7 harnesses the power of water and vacuum to give you the desired results. Penis sizes 5 inches to 7 inches when erect. Internal length 10 inches.