Eg: Optimizing your RotoVap - #155 by cyclopath
Or
Yeah, and/or not…mostly not. Unless welding on something bigger as you scale.
You can purchase or make gaskets that will get you from a sanke keg directly to 2” tri-clamp.
Kegs are a key tool for budget ethanol extraction. So much so that delta separations still ships kegs with their centrifuges. Where else are you gonna pickup 15gal food grade stainless vessels that handle vac and pressure for $25 each?!? Well worth throwing $ at fab later on so you can perform more sophisticated tricks with them.