code/modules/atmospherics/machinery/portable/pump.dm

PUMP_MAX_PRESSURE	Maximum settable pressure
PUMP_MIN_PRESSURE	Minimum settable pressure
PUMP_DEFAULT_PRESSURE	Defaul pressure, used in the UI to reset the settings
PUMP_IN	What direction is the machine pumping (into pump/port or out to the tank/area)?

Define Details

Defaul pressure, used in the UI to reset the settings

What direction is the machine pumping (into pump/port or out to the tank/area)?

Maximum settable pressure

Minimum settable pressure