For the Andreja, you'll need to purchase two.
This is the redesigned replacement magnetic water tank float for the Quick Mill Andreja Premium, Anita, and the Alexia. The original float had two small issues: It would occasionally take on water if a small hole developed, which would cause the float to sink and shut off the machine, and the magnet mounted inside to the top of the float would occasionally become detached and drop to the bottom. As much as both of these were a nuisance, neither of them would ever result in any damage to the machines since all it would do is shut the machine down. The new float has a much stronger magnet and the float itself is filled with a buoyant substance, thus solving the problems.
When replacing the float, it is very important to have the X on the float facing down.