Adds pipes with restricted connections to easily build parallel pipelines. Includes valves from the Valves mod.
Providing the player with new tools or adjusting the game interface, without fundamentally changing gameplay.
Augmented or new ways of transporting materials - belts, inserters, pipes!
Things related to oil and other fluids.
Instead of having to craft all different types of pipe pieces why don't you use placeable_by = {item = "pipe", count = 1} ?
placeable_by = {item = "pipe", count = 1}
I've tested and added that in 3.1