Pipeline Junction Cross

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The Pipeline Junction Cross allows liquid flow in any direction and can be used to split or merge pipelines four ways. Any configuration works functionally: one input - three outputs, two inputs - two outputs, etc. Flow rates are only limited by the individual pipes entering and exiting.


  • A junction can be placed on Foundations for precise placement. You can rotate it in 45-degree intervals horizontally.
  • A junction can be placed on Walls for precise placement. You can rotate it in 45-degree intervals vertically.
  • A junction can be snapped onto an existing pipeline, similar to snapping a Splitter onto a belt.
    • The junction can be rotated with its rotation axis aligned with the pipe, with a 45-degree interval.
    • On pipelines running parallel to machines, by holding Left Ctrl, junctions will snap to be in line with any pipe input/output ports of the machines. Currently, this does not work in all orientations however.
  • A junction can be snapped to an open end of a pipe. This means junctions can be aligned precisely in many more positions than with other methods.
    • To use this, build one of the pipes to be connected to the junction using any temporary Pipeline Support of your choice. Then delete the temporary support. You can now snap a junction onto the end of the pipe and rotate it in 45-degree steps.
    • Note however that snapping to completely vertical pipe ends usually does not allow you to rotate the junction in the desired direction. In this case you may have to build a (temporary) horizontal pipe first.


  • A Pipeline Junction Cross does not have a flow rate limit. If it is connected to two MK2 input- and two MK2 output pipes, it can transport up to 1200m3/min in total.
  • Similarly to Conveyor Splitters, a junction with multiple outgoing pipes will attempt to split the outgoing fluid equally between the outputs. This is assuming the junction is built on a flat surface, as pipes on lower elevation always fill preferrentially.
  • The Junction cannot be built directly onto a building's pipe connector, nor directly onto a Pipeline Support. Therefore, extracting more than 300 m3/min of fluids from extractors with just MK1 pipes is not possible.

Current issues

  • When splitting or merging many inputs/outputs of machines into or out of the same pipeline with junctions, the fluid at the far end of such a manifold may back up, even though the maximum flow rate of none of the pipe segments is saturated. The flow rates will fluctuate wildly in these cases.
    • For MK2 pipes, this may, for example, limit the usable maximum flow rate to below 450m³/min or less, depending on the exact setup.
    • As a workaround, the input pipe before- or the output pipe after the manifold can be split with an additional junction into 2 pipes, and then feeding the manifold from both ends.

See Also



  • Patch Pipe attachments such as Pipeline Pumps and Junctions can now be placed on Walls and Foundations
  • Patch 0.3: Introduced