In a previous review from user "Alex" the problem has already been described very precisely: The aerator is quite short and thus it can disappear so deep in Hahn that the cut-out for the orange lock no longer sticks out far enough. I was hoping, but that it would not hit me the adapter (not designer pieces, etc.) with me fits all 3 taps in the household not. I have then an adapter M22 bought at the hardware store x M24 and with the M 22 Ring of Gardena adapter to get to the correct length. The order is with me as follows: Hahn - M24 x M22 - M22 Gardena Adapter - M24 Gardena-aerator
The design simplifies for me pouring the plants and the water changes in the aquarium: Otherwise, the items in my opinion 5 star + deserves. Besides, I can so easily the balcony rinse clean. If I do not need the hosepipe it disappears together with adapter on the balcony, where it does not interfere. Clean the handling is compared to hauling watering cans also.