Topic: 75 400 four petcock. Question

[754]

I have a Varnish blue. 40. Tank with flipcap, I think 75. Male threaded bung,  maybe 20 mm.
Thinking of running the tank.. Would the petcock off a 75 planet blue 750 tank fit?
I am thinking maybe same thread.
 Tell me if you know or better yet, measure nut size on a 400-4, then I can compare to mine.
 The petcock is the type with the taper inside.

[Mantree]

I just went by a local customs shop and bought a aftermarket one for $15

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[scottly]

The bung on the tank is 20mm x1.5. (The OD of the threads actually measure 19.7mm) The ID of the threads on the nut measures 18.5mm.