"robin2
Well, I would have to redesign the mechanics: now the foam ball is kept into place by pressure. That means a motor would have difficulty lifting it while the foam is pressed inside the tube.
So I would have to design a cover lid, like in the schematic I uploaded, that is held by an arm or the like. That's why is was thinking about 2 position switch motors (forgot the name), as they only consume energy when flipping.
The lid would be held in place by the motor, because it has only 2 positions it is held firmly into place without energy.
Sadly no connection from the house can be made to the T-junction. Found this, but like I sais, can't break up the pavement sadly: Werking van de WaStop - YouTube