73 A Body Disc/Drum Proportioning valve

I've got 2 here, 1 cast iron body, the other brass body. Both have brake fluid now contaminated with moisture inside ( on a shelf for years ). Neither could be expected to function. I couldn't, in good conscience, use or sell one.
Factory service manuals state that these valves are not serviceable but I have seen aftermarket kits for them. In my opinion, new is the only safe way to go. Good luck