google turns up a bunch of options if you search that thread size/pitch and "plug".
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I wonder of you could 3D print a plug. Or, make one from delrin rod...
Now don't quote me on this,,,but as I recall I used some CPVC pipe and a coupling glued together for a thread protector. The coupling kept the pipe from dropping into the tank and was so simple it worked well.
That's a good idea for whipping, but not so much for plugging
7/8" x 14 UNF is just a fine thread bolt. Go to any fastener store and slap an oring on that bolt
so glue a cap on the end...
Maybe drink more coffee?
7/8" x 14 UNF is just a fine thread bolt. Go to any fastener store and slap an oring on that bolt
Is there any issue just using the valve? Or is that a no no? No idea what phosphoric acid does to brass.