We have a 2006 B39 which is also Coppercoated, & the skin fittings show pink on the outer flange. The holding tank Seacocks have been quite stiff for a while, so I’ve decided to replace the below waterline assemblies when we lift at end June.
I’ve bought reinforced nylon assemblies, made by TruDesign. About £120 for 2x38mm + 2x19mm assemblies (skin fitting, Seacocks & tail pipe). At that price it seems no brainer to change them.