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Air vent threads

Tesla
Tesla Member Posts: 4
Hoffman, Gorton, Maid O' Mist or whatever the manufacturer, in N.P.T 1/8 are the threads 1/8-27 or 1/8-28? I have two taps in the same kit 27 & 28 tpi, strange huh? Both in N.P.T.

I have made a list of some old valves I will be replacing:

Barnes & Jones Vent-Rite #51

USAV 1949

Hoffman Ventor #45

what would be the modern day replacement with Gorton vent's

Thank You!

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