Sportsways Waterlung main diaphragm, NOS

If you are lucky enough to own a rare Sportsways Waterlung double hose regulator then you already know what happened to the diaphragms in most of them since the 60s. This is a rare well preserved NOS diaphragm for your Hydro Twin, Hydro Twin II or Dual Air. We only have a few and when these are gone I do not expect to get any more.