I don't know about the type with a plastic ring around the top with handles molded into that ring. The type I used but later decided a different method would be better. In the meantime my production got big enough that I use 16 gal and 26.5 gal barrels (and 1 CDL 16 gal keg) For the more common type of Korny kegs I now think the best way is to weld a cover on the opening with a 2" half coupler welded on over a hole appropriately sized then use barrel bung plugs, I like the plastic ones better, because the chance of messing up the threads on the keg are very unlikely from cross threading and those plugs are about $1 ea.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.