Works but don't buy separately for the BZ Gen3
"I have a Gen 3.1.1 brewzilla and decided to buy the parts for the sight glass upgrade separately. That wasn't a good idea. Although it's not mentioned on PPSU sight glass upgrade bundle page, the Gen3 requires different parts to the ones listed in the bundle (doesn't use the valve in this kit and has a different top fitting that pushes into the PPSU tube). If upgrading for a BZ Gen 3, just buy the bundle. It's worth noting though that the whole set up isn't as stable for a Gen3 where only the tube is attached to the body of the BZ and everything above the PPSU tube is free to rotate and can even be pulled away. I managed to keep it all together by cutting the tube short enough so the bracket that holds the tube acts as a pseudo clamp around the top fitting. Mine doesn't spin in place now and doesn't leak at all but your results may vary..."