While I was messing around with Refinery and Fuel Loaders, I noticed they have output/input faces not to connect wiring but for something else, maybe a pipe. I thought I could connect each other, but I couldn't. So, what these faces for?
I tried to use Mekanism's Mechanical pipe but it didn't work either.
I tried to use Mekanism's Mechanical pipe but it didn't work either.