Prop valve fitting size

Muswagon said

Soooo does anyone know what size that is? If it is not 1/2 or 9/16 with 3/16 tube then I am lost as to what is considered special?

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We are talking about special as opposed to the standardized fittings that are normally on a "say" 3/16 OD tube as in the chart I posted. any thread other than those is not "standard." There is only one standard thread size for 3/16 tube and that is 3/8-24

On some masters (I think mostly GM) not only were 3/16 tube nuts special and larger thread, but some were DIFFERENT thread. I can still remember in the days when we sold master connected adapter tee's for brake controllers.