Add a 2"  inch tri clamp flange to any vessel...convert your boiler or fermenter to tri clamp sanitary fittings.

drill a 45-47mm hole into the wall of a tank or lid of a fermenter then fit this 2inch tri-clover fitting without any welding.

The internal diameter is 35mm. The tri-clover flange fits other 2" tri-clover fittings.

This is perfect if you want to fit an extension tube to the lid of a digital boiler like a  BrewZilla or Robobrew or Digiboil Lid to make longer reflux column still.