Hi all !

CO2 dosing is used in plant aquariums. The CO2 cylinder has a pressure reducer. Also known as reductor. There is a small pin on it. Needle valve. This is often difficult to set precisely because the tap handle is small. Even for a small turn, there are either too many bubbles or too few. This handle enlarging wheel is a solution for this. Due to its dimensions, it only fits some needle valves. (Aquario, Aqua Nova, Aqua Vivo)
This allows you to turn the tap much more accurately and slowly. I recommend that you wait a minute after each small adjustment so that the bubble counter adjusts to the new settings. And only then do we check if the new setting is correct.
The dimensions of other types of needle valves may differ significantly from this !

Recommended filament: PLA, PETG, HARD TPU
Recommended wall count: 3
Recommended infill: 50%

If the tool is useful for you, I will accept a like! :)