This is our Standard Vacuum Developer with trigger pump (no gauge), 8" cylinder and seal set. Note that the exact design of the trigger pump may vary slightly from the image. We always set out to offer our customers penis enlargement and potency development with only the very best apparatus available on the market. After much searching and research we have come across what we consider to be by far the best Vacuum Developer we have ever seen. Not to be mistaken for cheaper novelty type developers - this pump is of medical standards. This developer originated in Asia, was designed by a Doctor and is the winner of a number of medical awards for sexual innovation. Precision made in clear perspex of the highest quality, it has few rivals. A built-in safety valve ensures that the penis cannot be expanded beyond a safe limit. The unit itself is 8 inches long, and three different size latex seals ensure that, whatever your penis size, a snug fit can be made. The seals are now available separately so that they can be replaced at any time in the future - we can also supply all the spare parts for this developer ensuring that you enjoy years of service from this wonderful device. The developer works by first inserting the flaccid penis into the unit. The pump is repeatedly pressed, creating a vacuum - and often an erection. As the vacuum increases, the penis expands in size within the tube. If you are seeking enlargement then you pump until the size has increased more than your normal hard erection. When the size of your penis is about 1/2 inch beyond its usual, the valve is depressed, releasing the vacuum. This process is then repeated for about 20-30 minutes every other day. This version comes with a trigger pump (no guage).