Pale Blue PBR-20 is a miniaturized water vapor propulsion system in a 1U form factor. It is a fully integrated system that incorporates thruster head, fluidics, electronics and propellant tank, and is clusterable to meet a wide range of spacecraft sizes.

The PBR-20 uses water as propellant and does not require a high-pressure storage. The propellant is preloaded to the tank prior to delivery from factory so that satellite integrators would not have to deal with complex fueling work.

Read the full report: In-orbit operation verified again after 2 years in LEO – Pale Blue’s water-based propulsion system ran on a nanosat