The TunaCan Thruster is a safe, compact and affordable water-based propulsion system specifically designed for CubeSats and Small Satellites. Thanks to its convenient shape factor, it can be completely installed in the tunacan volume located outside the main CubeSat structure, leaving more room for payloads and other subsystems. Using only low pressure water as the main propellant, the propulsion system can be easily integrated into any satellite, and is safe for storage and launch operations. The high thrust, over 6 mN, and the low power consumption, below 20W, allows to minimize the use of the propulsion system and maximize the use of the payload during the mission.