Commander Chris Cassidy works on the Fluids Integrated Rack

iss063e001804 (April 21, 2020) --- NASA astronaut and Expedition 63 Commander Chris Cassidy works on the Fluids Integrated Rack (FIR) replacing components in the research device that studies the behavior of fluids in microgravity. The FIR will help promote the design of advanced space-based fuel tanks and other complex fluid transfer systems.