The Hydromax pump is different from regular pumps since it utilizes water, instead of air, to make a vacuum. Water appears to make a much better vacuum cleaner and feels much more comfortable to work with. The Hydromax x40 is offered in 3 distinct colors. You may either buy the obvious tube variation, such as mine, or you may elect for a semi-transparent redblue, tube. Unlike conventional pumps, together with use bulb pumps, the Hydromax pumps utilize a bellows design pump to develop suction simply by pressing the pump to the human body and relaxing. The vacuum could be controlled with a simple valve method to control water flow and strain. This valve was designed to be used one handed, but in my experience, the button could be somewhat rigid on occasion. Unlike the Hydromax x30, the larger x40 includes a more tube insert connected to the gray relaxation pad (The little that rests against your body) and this tube insert appears to help prevent the bellows from bending in any way, something that could occur with the x40 although maybe not as much with all the x30 only because the bellows are larger. You don't require the longer tubing with the pump. Additionally, I presumed the longer tube could halt the probability of skin becoming trapped at the bellows through pumping, but my friend assures me , even with no tube, he doesn't think that it will be possible to snare skin, as a result of manhood being vertical. In any event, the tube looks helpful for keeping an even pumping along with a fantastic balance.