Check out my latest episode!In this podcast doctor giving brief information and solutions.The so-called reservoir is positioned behind the abdominal wall during the process of implanting a three-part hydraulic prosthesis. The tank resembles a tiny bubble, filled with a saline solution. This solution is necessary to fill the cylinders which produce the erection afterward. You'll be able to pump the solution into the cylinders through a small pump within the scrotal sac.