Doesn't 2.0 now support this natively? Chemical buildings (the Lab and the Refinery) can be mirrored, which mirrors the pipes. It doesn't allow mirroring inputs and outputs separately, but I can't think of a situation where that makes a difference.

thanks for teaching me this trick!
however, i think it only works on blueprints
i still think this mod would be useful for many people, even if its just for independant flipping of in- and outputs and flipping already built buildings

You can mirror buildings while hand-placing, as well. The mirror keybinds work in both contexts.

And yeah - I'm not criticising the mod. Just curious, is all. I actually used Fluid Permutations for quite a while after 2.0 before I ran into this info in a random FFF :) There's definitely room for this kind of functionality.

it's work vanilla if you use G or H key for almost all recipe