Liquid Junction

Liquid Junction is a passive liquid transport block that allows two liquid lines to cross without mixing. Each end of a Junction is treated as if directly adjacent to the opposite end, so liquids flow through it instantly rather than being stored. Because the block has no internal liquid capacity, connecting two liquid-holding blocks with a Junction causes their contents to be shared with effectively infinite throughput as if the blocks were next to each other.

Liquid Junctions are most commonly used to route complex pipe networks where lines must cross, to isolate parallel pipelines, and to prevent unwanted blending of different fluids. They are also useful for arranging layouts where you want a fluid to bypass or cross over other fluid routes without interference.

Placement and terrain restrictions:

• A Junction can be placed on most floor tiles, but when placed in Deep Water terrain it requires at least one orthogonally adjacent tile (not counting diagonals) to be either a shallow-water-type tile or a non-liquid floor. This restriction prevents placement entirely surrounded by deep-water tiles.
• The same adjacency requirement applies when placing a Junction directly on tiles of Slag, Tar, Arkycite, or Cryofluid: at least one orthogonally adjacent tile must be shallow water or non-liquid terrain for the Junction to be valid.
• When placed correctly the Junction functions normally across these special-floor tiles; when placement conditions are not met the block cannot be built.

Behavior and interactions:

• The Junction does not store liquid and transfers fluids instantly between its connected ends; it effectively acts as a zero-capacity crossing point.
• Because ends are treated as directly connected, pressures and level-balancing behave as if pipes were contiguous through the Junction, enabling immediate equalization between connected containers where applicable.
• A Junction lets two independent liquid lines pass through the same tile without mixing; this is distinct from normal pipes which would combine flows.

Practical tips for use:

• Use Liquid Junctions to create compact highway-style fluid crossings where multiple fluids must cross without interaction.
• Place Junctions next to blocks that output items or fluids when you need to prevent those outputs from accidentally entering adjacent conveyors or pipes.
• Combine Junctions with pumps and valves to control direction and priority at intersections; remember that Junctions do not throttle flow themselves since they carry fluids instantly.
• When building in marshy or fluid-floor biomes, check the adjacency requirement before placing a Junction; adding a small patch of non-liquid floor or shallow water tile nearby will allow placement.