Concrete Pump rubber sealing 2"/3"/4"/5", 100% brand-new rubber, 100% Polyurethane Exact size, OEM available. NameConcrete Pump rubber sealingSizeDN50 (2inch) DN80 (3 inchDN100(4inch ... in concrete pump truck,concrete pump and pipeline connection seal in construction work equipmentService brands Schwing, PM, Cifa, Kyokuto, Zoomlion, Sany and so on Concrete Pump rubber sealing ...