I would bet its a CPI thread... a lot of high end pressure systems use CPI, also know as Instrumentation Thread. You can get those fittings as well...
I'd rather have a bottle in front of me, than a frontal lobotomy.
You can't be a real country unless you have a beer and an airline - it helps if you have some kind of a football team, or some nuclear weapons, but at the very least you need a beer.
My Cheap and Easy Stirplate