However... I certainly didn't intend to suggest a middle plate. Instead, I thought I'd use some wise words from a recent thread about plastic tops, and a resource from a shelved idea using copper microtubes.
So here's an overall view, with a theaded PVC fitting, glued to the top, for a polypropylene (or nylon) barb.
Why plastic? because it doesn't corrode.
the only issue I have with it so far is the milling of the area outside of the dimples: maybe I'll just leave it solid, that way I can build the whole thing with a drill and a hacksaw.
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