Originally Posted by carbking
the thread might be metric.
NPT threads are pretty much worldwide, but the comment is valid.
Have you seen metric threads on anything that should normally have NPT threads?

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.