Its not complicated, but the house water will be off, so its a good idea to get your ducks in a row before you start. Test ...

concealed housing, valve unit with stop valve and flush connector art.nr.: 220.022.00 Operating pressure: 0,3 - 10 bar Flow rate: approx. 20 l/min. (3 bar) Filter: 0,5 mm mesh size Sensor-sensitivity: ...