If its american its 1/8 nptOriginally Posted by marko
if its japanese its 1/8 bsp
don't screw the wrong fitting into the port, the fitting are off by 1 thread. I get a car a week that has a npt fitting screwed into a bsp hole that is leaking.
I AM TALKING ABOUT HONDA GUYS WITH TURBOS. THAT HOLE IS NOT NPT





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