Due to the consistent nature of the hydraulic pressure created by the Bathmate series of pumps, the girth of the penis will increase much faster than its length. This is because the surface area is greater around the girth of the penis than along its length. This will result in the penis touching the walls of the pump, meaning that the hydraulic pressure will not be able to further expand the girth of the penis. When this occurs, the user will naturally proceed to use an X40, however, many X40 users have commented that the additional space for length extension is not necessary as they have not surpassed the length of the X30 or the Hercules.

The Science: To achieve maximum hydraulic pressure, it is important to use the correct size pump. Customers are always advised to choose a smaller pump (provided their penis comfortably fits into it) as this will result in optimal hydraulic pressure around the penis. Using a pump that is too large will result in lower pressure around the penis, which means slower or no growth. This creates the need for the 7 WIDE BOY (X30 WIDE BOY). The Wide Boy has a wider vessel but no increase in length compared to the X30, which means that optimal hydraulic pressure is maintained resulting in faster growth.