Any particular reason for replacing the drains?
I had a slight leak in mine a few years back and bought a replacement. Before changing out, I changed the “O” ring to a viton “O” ring and has been fine since.. Still have the replacement as a backup if ever needed.
RV-10 40253 N253RV Flying
RV-14 140466 In build - Finishing kit
Douglas, GA. 2019 Dues paid