Hydro or water penis pumps are a new and extremely effective way to increase the size of an erect penis. Like standard penis pumps, hydro penis pumps use pressure to increase blood flow to the penis tissue. Where Hydro Pumps differ from standard air penis pumps is with the use of water to force pressure rather than air. Bathmate is the most well-known brand of penis pumps using water with their flagship pump being the Hydromax.
