This a simple model I have made to attach a sodastream bottle to an iKegger 2l growler.

I am using 2 of them, printed in PLA.

Each brace requires 2/21mm (approx) x M3 bolts/nuts with a round head (diameter ≥ 8.5mm)

Happy to make other versions if you can tell me what you want.

Have fun making!