Rinsing adapter French horn

We needed an adapter to thoroughly rinse a French horn. 

The adapter is screwed into the hose of a shower and put into the French horn instead of a mouthpiece. 

When the shower valve is opened, the horn gets rinsed.

 
Before I put this together I had no clue, how many different fittings there are for shower hoses. People claimed, it's mostly 1/2 inch, so I designed a ½ inch adapter - just to see when it started printing, that this is certainly too small → interrupted printing. 
 

Then I checked one shower hose and found that it's ¾ inch, so I redesigned. This one fits this specific hose, but afterwards I saw that the other shower seemingly has an M22 (metric) thread. 
 

So, before printing, better check if there are chances that it fits. 
Printed using Prusa Mini+, 15 mm layer height and 10 K higher temperature than usual with PLA.