Water-cooling Thread Size APS80100

I have been looking all around to get the specs on the thread size for the APS 80100 water-cooled motor threads.

I am trying to put a 90 degree adapter on my motors instead since it will allow me to fit necessary attachments. Something like this here which would be low profile enough for what I need. The motor looks like g1/8 but I cant tell for sure since my calipers have not arrived. I am also thinking this cant be the case as it would likely be a metric thread size… any ideas?