I have used the DP-4000 and have found it to be technologically far above non computerized pumps. It allows for diverse protocols only limited by your imagination. I have found spiking, for example, is a process of jumping to a substantially higher vacuum briefly , very constructive in optimizing the enlargement process. This pump can perform any patterns of spiking desired and to my amazement keeps the counterproductive edema minimal , which is great news! This great pump can be coupled with the Stallion Cock Cushion which increases the penile internal pressure thus holding the penis in a pumped or semi pumped state facilitating tissue acclimation to a larger size more quickly and effectively .

I have recommended this combination to many students/clients.

Dr. Richard R. Howard II