Way Beer Brewing Gas Manifold CO2 Distributor Splitter Beer Integrated Check Valves Homebrew Beer Making Brewing Tool, possible to screw in the duotight connector 7/16 - 9,5 mm

length 13cm 

with ready wholes to catch to the wall ( 5mm diameter )

this fits to the entrance and outcome :https://minikeg.sk/sk/ball-lock-jolly/1153-duotight-spojka-na-jolly-narazac-716-95mm-38.html