Do you use metric pipe fittings?
no, none exist, you have NPT, (National pipe thread) which are tapered and you have BSP which is straight. they have a different thread pitch as well. however you can run into some that are called OSB, (o-ring sealed back), they are usually 9/16-NF, 3/4-NF of 1 1/8-14. NF is National fine.
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