Hello, the Danfoss adapters supplied with the Fritz!Dect 302 are sometimes very tight and do not fit on every radiator valve. In addition, the enclosed screws in the adapter are usually too short. I ordered an EQ-3 Danfoss adapter set from Galaxus. The one that looks the same as the one from AVM is slightly wider and fits perfectly. I also bought longer M4 x 16 mm pan-head screws from Jumbo. With these two additions, I was able to connect all the adapters to the Danfoss valves without any problems. I wish you every success.