Pipelines and Valves

Would be made out of copper and it should help transport fluids from one place to another.

Valves should have 4 pression levels, fully open, half opened, almost closed for dripping effects and a fully closed one.

And a new kind of door with a valve opening mechanism made out of copper, and you may need wax to prevent it to get stuck or else you'll need to click the valve more times than usual.

This may even allow for a new kind of structures spawning, like a lab or someting. Not related, as it isn't the main idea.