1,double flanges rubber expansion joints 2,ISO9001 and CE certificate 3,good serive 4,do OEM double flanges rubber expansion Table of Materials ... wire4 Flange: Mild steel , Cast Iron, Ductile Iron and so on Technical Consition Nominal core diameterDN32~DN300(11/4 ... Main Parameters of Nominal Core Diameter, Length, Displacement Value and Flange Nominal core diameterDNLength L (mm)Axial displacement(mm ...