Bissell Big Green Cleaning Maschine connector for small vacuum nozzle

I lost the connector between the main handle with valve and the small vacuum nozzle, so that the suction works, but the cleaning fluid can't be used for cleaning smaller parts (car seats, sofas etc.).

Also needed is a grommit for that part, which I made from a silicone cooking pot cover. Outer diameter is 5/16" / 16mm. Inner hole is ~2mm.

Spare parts aren't available anymore for that model:
https://www.bissellersatzteile.de/search.pl?query=1671e&page=2

So a self printed tool is the solution to keep the good working cleaner in the race :-).