Rubber diaphragms and oil filled environment sealing Chambers were discontinued when regulators needed EU Nitrox certification.
The most common material used for main diaphragm is fabric reinforced EPDM.
See
1st Stage Diaphragm: Replace or Re-Use?
The most common material used for main diaphragm is fabric reinforced EPDM.
See
1st Stage Diaphragm: Replace or Re-Use?