Ultra Clean 1 Triple Hydrogen Specific Filter Kit for GC. Includes (1) 1 position base plate with 1/8 Brass inlet/outlet fittings and (1)Oxygen/Moisture/Hydrocarbon Hydrogen Specific Trap. The Hydrogen-Specific Triple trap is ideal for purifying hydrogen in GC/ MS systems. This trap is packed and purged under hydrogen and contains oxygen, moisture and hydrocarbon scrubbers in one cartridge.