Expedition 73 Flight Engineers Nichole Ayers and Anne McClain pose for a portrait during maintenance activities

iss073e0071535 (May 16, 2025) --- (From top) Expedition 73 Flight Engineers Nichole Ayers and Anne McClain, both NASA astronauts, pose for a portrait while verifying the functionality and replacing hardware on the Exploration Potable Water Dispenser (xPWD). The xPWD is located in the International Space Station's Destiny laboratory module and is demonstrating advanced water sanitization methods, microbial growth reduction, and a heater to dispense hot water for use aboard the orbital outpost and future spacecraft.