This sealing diaphragm functions as a flexible barrier within a pneumatic control circuit. It responds to pressure differentials to actuate or modulate air flow in the system. The diaphragm sits between the actuator housing and the valve body, converting pneumatic pressure into mechanical movement. A worn or torn diaphragm causes air leakage, resulting in sluggish actuator response or complete loss of function. The manufacturer produces this component to match the original housing's seal profile, ensuring the diaphragm seats correctly without additional shimming or modification. On reinstall, verify the housing surfaces are clean and free of debris to prevent premature failure.