Rubber diaphragms are sealing materials used to prevent leakage or friction. They are designed to withstand the effects of pressure while preventing any form of liquid from escaping. Rubber diaphragms are a barrier between two enclosures or chambers to prevent contaminants from entering. They can be static or dynamic where a dynamic diaphragm can be activated by the slightest amount of pressure.
gas valve diaphragm
OEM silicone rubber diaphragm for gas regulator rubber gasket