-10AN Aluminum, male fitting to bolt to your turbo oil drain flange.
These used to be called the standard "Mitsu-Series" for any Mitsubishi Flange (16g, 18g, 20g, etc.), but so many turbo companies are using these on whatever they want these days, it's hard to put a label on them anymore! So just check the dimensions before you buy.
This "Mitsu" flange (right) is the same as the GT-Series flange, but the Mitsu thread holes are smaller (measuring about 1/4").
