Late '31 shut off valve

[HalcyonDays]

I am attempting to clean old varnish from my late '31 gas tank. I am having good luck with denatured alcohol. The process would move along much faster if I could replace the shut off valve on the tank with a barbed fitting. Does anyone know the tread size/count of the male adapter that would screw into the tank fitting?


My thought would be to drain the tank with this fitting attached to a hose. Any help would be great.

[Big hammer]

So your wanting to remove the valve and screw a fitting into the tank? 3/8 NPT You’ll want to clean out trough just inside of the removed valve .

[HalcyonDays]

Thanks for that information.

[ndnchf]

When you get it all clean, do yourself a favor and solder a pencil filter to the inlet of your new valve. It will reduce the chance of damaging the valve seat and a leaky valve if other debris makes its way through.

[gtovet49]

Interesting. Where can one get these?

[ndnchf]

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Originally Posted by gtovet49

Interesting. Where can one get these?

The pencil filter? Most of the model A vendors sell them.