Gas Refineries, also known as gas foundries or gas mines, were manufacturing facilities designed to process and purify various kinds of gasses, transforming them into practical resources for blasters, spacecraft, and energy-producing systems. A prominent example of a gas refinery is Cloud City situated on Bespin, which processed the planet's naturally occurring tibanna gas into a fuel source suitable for blasters. In the era of the High Republic, the Nihil commandeered a derelict gas foundry located on the planet Xais, utilizing it to supply fuel for their armada.