*slap*bump
Since there's already a way of producing O2 through plants/crops, the player can take advantage of benefits from other mods that produces O2 by electrolysis. This is an existing feature of Mekanism, Mic could make it so the oxygen pipe connects Mek's O2 gas tank to the GC's oxygen storage module, and the Mek's H2 gas tank to the Refinery which would convert H2 to fuel. GC could have a pipe for liquids, such as fuel and liquid hydrogen.