Coolant was a term for substances used for cooling things. Several different types of coolant were in use in the galaxy and several substances were used as coolant. The Galaxy IV Coolant Refinery was a defunct coolant factory on the planet Coruscant. Starship weapons required coolant maintenance and monitoring, as was performed at the Number Two Turbolaser Coolant Room aboard Outbound Flight. Non spin-sealed Tibanna gas was used as hyperdrive coolant.