... :16,25,38,50,76mm 3) ISO 9001:2008 4) PE,PP,RPP,PVC,CPVC,PVDF Plastic Pall ring most suited ... factorPall ring2525x25x1.22139185483002853838x38x1.41519182158002005050x50x1.5100926063001307676x76x2.6729262193092 Plastic Pall Ring-- PP, PE,PVC,PVDF