[modeleng] Mystery thread

Gents,
        I have been asked to test and cerify a boiler (LBSC Bantam Cock) and the
pump connection bushing is a 3/8-26 thread.  This isn't a standard thread
for anyone . . . even Tracy Tools lists it as a special.  What in the world
thread series does this come from?  Is this one of those cycle threads I
always heard about?
        I also hope everyone has had a very pleasant and safe holiday.


Regards,
Harry Wade
Nashville  Tennessee

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