Concrete Pump Spare Parts--rubber sealing ring 2"/3"/4"/5", 100% brand-new rubber, 100% ... Polyurethane Exact size, OEM availabl NameConcrete Pump Spare Parts--rubber sealing ringSizeDN50 (2inch) DN80 (3 inchDN100(4inch) DN125(5 inch)DN150 ... , Zoomlion, Sany and so on Concrete Pump Spare Parts--rubber sealing ring