Basically, a penis is composed of three structures, which are made of a spongelike material that can fill with blood:

The two corpus cavernosa contain the central arteries and lie on the top half of the penis. They are cylindrical tubes and are larger than the other spongy structure.

The corpus spongiosum, which is under the two corpus cavernosa and surrounds the urethra, is the pipeline for both urine and sperm.

When a man becomes sexually excited, the nerves surrounding his penis become active, causing the muscles around the arteries to relax and more blood to flow into the penis. The sponge like material then absorbs the additional blood, making the penis stiff and hard, or erect.

The Bathmate Hydromax is the new generation of penis enlargement pumps. It is made for usage in water, no matter if in the shower or the bathtub. In contrast to regular penis pumps, they don’t use a conventional vacuum, but warm water for maximum effectiveness. Although gains are primarily in girth/circumference and less in length compared to other penis enlargement methods like jelquing or exercises in general, it’s the only pump delivering permanent and safe results without any side effects or negative influence on penis health.

The Bathmate Hydropump creates a vacuum inside its plastic tube. The vacuum forces your penis to enlarge to fill the inside of the tube, which forces blood into your penis, stretching and inflating your penis. At first, you’re just bigger because you’re “pumped up”, but eventually you can achieve long-term penis growth.

When we, men get an erection, our brain releases a hormone for our body to send maximum blood flow to the Corpora Cavernosa (penis chambers) which fills them up and creates a firmer erection. The Hydropump uses a vacuum to enlarge the penis, forcing more blood into it and effectively causing an erection. This is the reason why pumps have been used for years to treat ED.

By using it in the daily basis, causes the blood vessels to expand which penis allows more blood to fill in the erectile chambers and it creates harder, and bigger erections.