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TR2/3/3A Vacuum Advance Union Size

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Skidude

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I just found that my vacuum advance line is not attached underneath the carburetor - the union nipple is missing. (59 TR3A). Does anyone know the correct size (dimension and thread size) needed for this part? Would like to search and find a suitable part locally instead of ordering from Moss and having to a week to receive.

If a locally sourced part is not suitable - I will order.

Advice?
 
I think this is what I used, from McMaster-Carr:

5121K381 Chemical-Resistant Barbed Tube Fitting for
3/16" Tube ID x 1/8 NPT Male, 250 Degree
F Maximum Temperature, packs of 10

The tube end is big, for 3/16 ID tubing, but I fit it to the narrow vacuum line with a cascade of a couple tube sizes.

This is for a TR4A Stromberg, so SUs might be different, but the idea of using an ordinary commercial part always appeals to me. It should be easy to measure the hole for the fitting.
 
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