[weq92f]

The guy, turns out, is a re-seller rather than the manufacturer. Still...

Looking down in the hole in the radiator, I see that there is a flare down in there ( inverted flare? ). The fitting I took off my old radiator has the corresponding flare to match that but the threads are incompatible.

This is the key:

1/2" 20 STRAIGHT THREAD G1/4

I think this means:

1/2": the bung size in the radiator for the tranny cooler
20: thread count or something to describe the threads
STRAIGHT THREAD: parallel rather than tapered thread
G1/4: again, describing the threads here I think?

However, nothing describes the properties of the flare and how to match up a fitting with it so that it seals properly.

I don't know if the fitting needs to seal at the threads, at the flare or with an O-ring.

This is not rocket science methinks. There are millions of these fittings in use right now. Surely somebody can make sense out of the above to help me determine what I need.

Thanks,

-klb