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.

Price $45.00 each plus 3.00 shipping.