Many vacuum bleed adapters use "Andreani thread" named after the Andreani vacuum bleed machine. It's actually an 1/8" BSPP (British Standard Pipe Parallel) thread.
Adapters from BSPP to NPT are available:
https://www.amazon.com/dp/B0CLHK1CP2
https://www.amazon.com/dp/B01LQU8FV8
NOTE: There is a British Standard Pipe Parallel (BSPP) and also a British Standard Pipe Taper (BSPT). Make sure you purchase the Parallel.

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