Sight Glass Mod


Hello first time threader here at Robobrew. Does anyone know what size hole is used for the ball valve?


It’s a standard 1/2" fitting. The hole itself is around 21mm diameter.


I bought a sightglass from Brew
It fits in the ball valve hole without a problem and no leaks. So, no drilling nessesary. Also the sightglass fitting will accept the Robobrew ball valve.


Nice find. Is that the 16" sightglass from


Yes it is from Brew


Nice find for a sight glass. How did you attach it at the top? It looks alot like the Fermentap sight gauge i have seen online and was thinking about getting. But your source has a much better price that others i have seen.


It’s not attached at the top