Flange is high wear-resisting, aging resistant, long service life, high security, highly pressurized, widely used Concrete Pump Flange: 1)Size:DN125, DN150, DN175 2)Standard:ASTM,ANSI,JIS,DIN,EN 3)Material:A105,Q235,WCB,CF8,CF3 and so on 4)Type:Socket-weld,Welding neck,Slip on,etc. 5)Pressure Class:150-2500LB,5-30K,PN0.25-32Mpa 6)Special design available DN125 concrete pump flange