This silicone diaphragm is perhaps the last you will ever have to buy. Silicone will out last any other rubber products out there. I do not need to tell you Voit lovers what OEM gray diaphragms are like today. TheSCUBAMuseum.com has a limited number of 2 stage diaphragms available as well for you Voit Navy divers out there.
Price $20.00 plus shipping for single stage.
Price $35.00 plus shipping for two stage (very limited quantities).