I should know this cause I have one installed in each of my fuel rails, but for the life of me I can not remember what it came out of. I am thinking it was some type of 90's model front wheel drive V6 GM car. (could even have been a buick or pontiac) Its not NPT threads, but it threads on and seals with a rubber/aluminum washer. I cant remember the thread size though. Heres a pic of it installed in my fuel rail.
2012-01-28110659.jpg
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