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ISO2531 Flange Reducer Ductile Iron Pipe Fitting Taper. Superior Pressure resistant Performance::Made of GGG40/50 ductile iron, withstand PN10/16/25 working pressure to keep pipeline stable under harsh operating conditions. Long term Anti corrosion Protection: Epoxy powder coated surface resists underground corrosion,extending service life up to 50 year for buried water pipeline projects. Reliable Flange Sealing & Easy Installation: Full flange connection design enables quick assembly and disassembly, zero leak performance with standard gasket matching.