Yeah I think an old Briggs and Stratton engine was the only time time I remember using SAE. I mean I still use SAE [Tap] die sets but the irony is the nut outer is metric.
It's funny how often I have to repeat myself; as in you need 3/8 brass pipe or 1/2 brass pipe, no not 3/8 compression or flared. I work on high end espresso machines these days, like 20-40k ones.