The last scrap !!! 3

Caution - these nozzles are a case for the protection of consumers !!!
The connections do not fit: the riser has a threaded nozzle none - thus a waterproof and stable screwing together is impossible and the water squirts out everywhere! One can the two parts only loosely into each other = unstable and leaking, holds in any way!
The HEISSNER customer service you can forget also: uninterested emphasizes disbelief, although experienced in practice so as well and somehow accommodating in any way.

We have resorted to us with the help of a professional gardener ultimately ourselves by silicone tape around the threads of the missing nozzle wrapped (Practical tip!). The silicone not only provides a thicker and therefore more stable plug connection, but seals by the silicone material also against the water.
With this workaround, the nozzle now holds some extent on the riser and it also injected not as strongly out. Although now well improvised, but so certainly not in terms of a bona fide purchaser who rightly expect a working system!
A star for this scrap is still too much, but not less went ...