Iwaki replacement pump diaphragm for EWN-B31, EWN-C31 and EWN-C36-V electromagnetic metering pumps. The assembly combines a PTFE process-side diaphragm (EH1974) with an EPDM backing element (EJ0162) for chemical resistance and mechanical support. Fit and orientation follow the Iwaki service bulletin for the EWN dosing-pump family. Reference part number E0024.
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