I think to get one of the manifolds for copper sweat you need to get it from Supply House or you can find them on Ebay. Just be carefull, the prices vary widely for the same thing. Back when I got my 4 manifolds I paid $18.99 each thru Ebay, but others offered the same spec manifolds for up to and even over $100 each. Those are vendors preying on buyers who think they can't get them for less, or are under the impression that a $20 one with 6 take offs is higher quality at $100 than $20. They are the same. Be careful not to get ones made for Pex, they will then cost loads to convert to copper sweat at the cost of heat exchange space.
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.