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The ITCS pump package assembly (PPA) is utilized in the Internal Thermal Control System (ITCS) of the International Space Station (ISS). The PPA circulates coolant throughout the ITCS system and provides for coolant expansion and contraction due to thermal excursion. The PPA is designed to operate in the International Space Station laboratory, habitat, and node II modules to circulate coolant for electronics and avionics cooling, experimental rack heat loads, and critical life support equipment.

The dual membrane gas trap filter is utilized in the internal thermal control system (ITCS) as part of the pump package assembly to remove non-condensed gases from the ITCS coolant. This improves pump performance and prevents pump cavitation. The gas trap also provides the capability to vent air that is Ingested into the ITCS during routine maintenance and replacement of the International Space Station (ISS) system orbital replacement units. The gas trap is composed of two types of membranes that are formed into a cylindrical module and then encased within a titanium housing. The non-condensed gas that is captured is then allowed to escape through a vent tube in the gas trap housing.