Here are the instructions for the replacement of the pump heads:

1- Remove the back cover of the device using the 2.5mm Allen Key provided.

2- Unplug the hoses from the pump head, you might expect some leftover water that was inside the hoses to come out.

3- Remove the pump head by pressing on the two plastic clips on the left and right of it while pulling it upwards to unplug it from its base.

4- Plug in the new pump head and make sure to push it all the way down until you hear a click from both sides of the pump head.This means the pump head has engaged with its base correctly.

5- Plug the tube hoses back to the pump head as they were initially. To be sure that you have the right connections, you should see the hoses crossing each other.

You can check out how to replace the pump head below.