There are two types of in-ground systems - "On- floor" system and "Under- floor" systems.On- floor" system In the "On- floor" system a lid in the floor is opened and a hose kit is attached to the extraction outlet when used. After the work is done, the hose is removed to its storing place and the lid is put back in closed position.
"Under-floor" systemsIn the "Under floor" system the hose is pulled up from under ground when used and pushed back under ground after the work is done.