Removes all belts and adds pneumatic in/out stations (with built in inserters) that convert any/all items into fluid-like states for transport through pipes.
Alternative lore: LIQUIFY EVERYTHING!!!!
SpaceBlock adds a special landfill recipe, consuming 1 red science and 5 landfill and creating 10 landfill. With Pneumatic Transport installed the recipe becomes 1 of every science and 5 landfill, which is quite impractical in comparison.
I have no idea why this would happen or any workaround for it, but these two mods otherwise seem like they would be very interesting together, because of how the replication recipes work.