Not Ranked
Now for those of you who want to really blow your mind...
There are too many fluid fitting sizes.
37 degree JIC
45 degree SAE
Metric
British Standard (still used believe it or not)
Tube (yes, tube flare fittings)
NPT (National Pipe Thread) an abortion which should be avoided at all costs
o-ring boss--really cool, relatively new stuff that doesn't leak.
Don't forget all the inverted male, female stuff...
Yes, all the threads are different and none of them are interchangeable. It is enough to drive you nuts. You get used to it after you work with it.
I highly recommend Carroll Smith's plumbing book to all.
David
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