Fluid Junction

Lore & Background

In the sprawling alien landscape that the player colonizes, fluid management quickly outgrows the simplicity of a single pump-and-tank setup. The FICSIT design philosophy—evident in every buildable from the humble Conveyor Belt to the colossal Rocket—favors modular, stackable components that let a lone engineer scale from a single oil rig to a continent-spanning refinery. The Fluid Junction embodies that philosophy in the liquid domain: instead of building an entire parallel pipeline for every fluid variant, a single Junction lets you swap feeds on the fly, keeping your factory floor clean and your logistics graph legible.

In Their Own Story

The wind off the salt flats carried a faint hiss of pressurized gas. Mara wiped grease from her visor and crouched beside the Junction, listening. Four input ports, four output ports, and a soft green glow where the active channel pulsed. She toggled the signal from her handheld console—click—and the Crude Oil line went silent while the Refined Oil line hummed to life, threading its amber stream toward the Refinery three hundred meters east. "There you go," she murmured, tapping the Junction's casing. Somewhere behind her, a Packim took a curious bite of a conveyor belt and spat out a rubbery squeak. She didn't turn around. The factory was running, and for tonight, that was enough.

Reader's Guide

The Fluid Junction is the buildable that finally makes fluid logistics feel *designed* rather than *dug*. It sits at Tier 2, so you'll unlock it after you've already been wrestling with a tangle of pipes and wishing you had a way to say, "Hey, this machine should get Refined Oil right now, but Crude Oil in twenty minutes." That's exactly what the Junction does: four fluid inputs on one face, four fluid outputs on the other, and a simple rule—whichever input is carrying flow, that same fluid exits through the matching output. Everything else stays shut.

The inputs and outputs are all standard fluid sockets, so you can drop it between any Pumps, Tanks, or Machines without adapter nonsense. No power connection is required; it's a passive routing device. You control which channel is active via a signal (the same logic you'd use for a Conveyor Sorter or a Filter), which means it slots neatly into your existing automation brain.

The first time you wire a Junction between your oil pipeline and a single Refinery, and you watch the amber stream *switch* from Crude to Refined with a soft mechanical clunk while the other three ports sit perfectly still, something clicks. You stop thinking in pipes. You start thinking in *channels*. That's the design intent right there: one box, four lanes, zero spaghetti. It's the fluid-domain equivalent of the Conveyor Sorter, and once you've used it, you can't go back to building four parallel lines for four fluids.

Did You Know?

• The Fluid Junction is the fluid-domain counterpart to the Conveyor Sorter: both let you multiplex multiple streams through a single device using a control signal.
• It requires no power connection, making it a purely passive routing component that can be placed anywhere in a fluid network without adding to your energy budget.
• Because it only passes the *active* channel, all other ports remain sealed, which means you can share a single downstream pipe between multiple upstream fluids without cross-contamination.
• Players commonly pair it with a Timer or a Comparator to automate feed-switching, effectively turning one Refinery into a multi-product machine without building a second one.