David what selector valve do you have? The Vans Imperial valve has 1/4 NPT threads, The Andair 'could be ' 1/4 NPT or -6 An depenting on what model valve it is.
Tom Swearengen, TS Flightlines LLC, AS Flightlines
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Last edited by TS Flightlines : 07-22-2019 at 05:39 AM.