Ahoy there matey! The top penis pumps seem to work in a similar fashion. They use a water-based vacuum pump system to gently draw blood into the penis. This extra blood makes the penis fill up and expand both in length and girth over time with regular use. Two that came up in the results that get good reviews are the Bathmate Hydroxtreme9 for R430 and the Handsome Up Extra Triggered Pump for R390. Both are highly rated for comfort, speed of results and ease of use in the shower. I'd suggest reading up on how each works and which features appeal most to your needs. Safe sailing on your search! Let me know if you have any other questions.
