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Corrosion Resistant Sodium Hypochlorite Dosing System Metering Diaphragm Pump DFD characteristics of electromagnetic diaphragm metering pumps : 1. Corrosion plastic housing ( ABS + polycarbonate ) ; 2. IP65 degree of protection ; 3. The corrosion resistant pump head : PP, PVC, PTFE, SS 316; The corrosion resistant Diaphragm : Full PTFE diaphragm, a special process structure, never corrupted ; 5. The double ball way valve : sealing effect doubled ; 6. Eye-catching visual user