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@rive_gauche
hi andy, so it seems like there's the steel, the alloy and the cnc models. i'm sure all pressure bearing parts will have been machined in order to fit seals so the cnc moniker is 99% marketing. of course the tube may have been cnc skimmed for roundness..
the steel will generate up to 160psig apparently, the alloy 220psig; both have flip head chucks.