A compact modular, stackable design for GC gas supply, like this one: ISQ 7000 GC-MS System.
From top to bottom:
Zero Air Generator
Supplies clean, dry, hydrocarbon-free air to used as detector gas.
RS386_Precision Zero Air Datasheet
Nitrogen Trace Generator
Provides a constant and consistent source of zero nitrogen for carrier and detector gas.
RS385_Precision Nitrogen Trace Data Sheet
Hydrogen Trace Generator
Suitable for flame gas and carrier gas at trace detection limits.
RS383_Precision Hydrogen Trace Data Sheet
Independent air supply for Nitrogen and Zero Air Generators.
Duplex compressor mounting system to dampen noise and vibration.
RS381_Precision Compressor Spec Sheet
Like new, hardly used.