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This is a quick reference to the various components of a piped-fluid network.

Component	Kit	Inputs	Outputs	One-way?	Switched?	Compressor?	Max. Power	Primary Function
Pipe (various shapes)	Kit (Pipe)	2-6 generic		No	No	No	-	Provide a pathway.
Pipe Valve	Kit (Pipe Valve)	2 generic		No	Manual only	No	-	Open/close flow manually.
Pipe Digital Valve	Kit (Digital Valve)	2 generic		No	Yes	No	25W	Open/close flow using logic circuits.
Pipe Volume Pump	Kit (Volume Pump)	1	1	Yes	Yes	Yes	800W, varies	Pump fluid at adjustable rate.
Pressure Regulator	Kit (Pressure Regulator)	1	1	Yes	Yes	Yes	100W	Achieve target pressure at output.
Back Pressure Regulator	Kit (Pressure Regulator)	1	1	Yes	Yes	Yes	100W	Achieve target pressure at input.
Pipe Gas Mixer	Kit (Gas Mixer)	2	1	Yes	Yes	Yes1	100W	Mix fluids: Combine two input mixes into one output mix, at an adjustable ratio.
Filtration	Kit (Atmospherics)	1	2	Yes	Yes	Yes	5W	Sort fluids: Separate an input mix into a pure output and a "leftover" output.
Electrolyzer	Kit (Atmospherics)	1	1	Yes	Yes	Yes	1,400W	Create fuel: From input H2O, output mixed O2 and Volatiles.
Air Conditioner	Kit (Atmospherics)	1	2	Yes	Yes	Yes	7,000W, varies	Heat or cool a fluid: From input, split heat between right-temperature and wrong-temperature outputs.
Wall Cooler	Kit (Wall Cooler)	space	1	Yes, for heat2	Yes, for heat2	Yes, for heat2	?	Cool a space: Actively remove heat from a space into a pipe.
Active Vent	Kit (Active Vent)	1 pipe, 1 space		Yes, reversable	Yes	Yes	100W	Pump pressure between a space and a pipe.
Passive Vent	Kit (Passive Vent)	1 pipe, 1 space		No	No	No	-	Equalize pressure between a space and a pipe.
Gas Tank Storage	Kit (Canister Storage)	1 generic		No	No	No	-	Small storage: Attach pipes to Gas Canisters (removable, inventory-portable fluid storage).
Tank Connector	Kit (Tank Connector)	1 generic		No	No	No	-	Medium storage: Attach pipes to Portable Tanks (removable, luggable fluid storage), and also to Portable Air Scrubbers and Portable Air Conditioners.
Small Tank	Kit (Tank)	1 generic		No	Logic only?	No	-	Permanent, high-capacity fluid storage.
Large Tank	Kit (Tank) × 5	1 generic		No	Logic only?	No	-	Permanent, super-capacity fluid storage.

Kit: The item used to build the component. All of these items are manufactured with a Hydraulic Pipe Bender or Fabricator, except where noted.

One-way: Does the component prevent fluid from flowing the wrong way, from output to input?

Switched: Does it prevent all flow when switched off or unpowered? Except where noted, switched components can be switched either manually or using logic circuits.

Compressor: Will it actively increase pressure in the output and decrease pressure in the input? If no, the component only allows pressure to change toward equilibrium between input and output, or it does not enable any pressure changes.

Note 1: While the Pipe Gas Mixer will actively compress from output to input, it will stop when either input is empty, to preserve the mix ratio.

Note 2: The Wall Cooler's one-way, switched, and "compressor" qualities apply only to the heat exchange. It does not directly affect the pressure or flow in its attached pipe.