I received an answer, or, a statement from ThermalTake Technology:
CS06 (Thermaltake Technology)
Aug 6, 2021, 14:53 PDT
Greetings,
The only information we have in regards to your inquiry is a lightweight POM and PMMA construction. As far as the pump goes, we know that any metal that comes into contact should not rust or deteriorate as long as the system is routinely maintenanced.
Best Regards,
Thermaltake Customer Service
800-988-1088 (M~F) 9:00am - 5:30pm