Tests determined the effectiveness and reliability for each pump. A large number of other penis pumps failed after only less than 100 strokes. Tests measured the amount of vacuum created and sustained or if there were leaks due to air loss.
With squeeze bulb pumps and the centric pumps, vacuum was not sustained because the pumps are attached to a straight cylinder with glue where air leaks would occur. The electric pumps sold by some companies use a fish aquarium motor converted from blowing bubbles in water to suck air. The vacuum created was minimal and not the vacuum needed for penis enlargement.
The Dr. Bross exclusive Power Vacuum Controller is included in all their pumps and creates and sustains the vacuum needed for penis enlargement. This feature is not found on the other pumps.
The Dr. Bross cylinders are made of the highest quality injection molded clear Resin-K for strength and to easily view the penis enlargement. The cylinder is totally enclosed to prevent vacuum loss. The other manufacturers cylinders were cloudy and the plastic was cut from straight raw stock and glued to the pumps.
After all of our tests we have determined that the Dr. Bross Penis Pumps are far superior to any other vacuum pumps for penis enlargement.