# Gas Canisters Gas canisters are a way to store gas in a portable container for easy transport. They can store [color=orange][protodata="StorageCanister" comp="GasCanister" member="Volume"/] liters[/color] of gas. You can connect handheld tanks to a gas canister to refill them using the release valve on the canister. The release valve also has a adjustable pressure regulator to control the pressure of the handheld tank connected. Opening the release valve on a canister with no handheld tank connected will release gas into the atmosphere, at the specified regulator pressure. [bold]Be sure to close the release valve before you eject your handheld tank![/bold] ## Connector Ports Gas canisters and [textlink="portable scrubbers" link="PortableScrubber"] can be connected to a [textlink="pipenet" link="PipeNetworks"] by anchoring (wrenching) the device on top of a connector. When connected, gas will be free to move in and out of the canister to balance pressure, temperature, and composition. A pump can be used to insert or extract gas from a canister, useful for filling or emptying a canister entirely.