With the "The Retractable Hose Central Vac System", the vacuum hose is stored inside the wall. Each outlet has a hose hidden within the system´s own vacuum tubing. When you´re finished, the suction from the central vacuum unit retracts the hose back out of sight. Then, you simply carry your handle to the next inlet.
Note: There is a small bit of a petroleum jelly type of material in the kit that should be used on the o-ring before installing the unit in the wall.