... ''/7''/8'' 100% brand-new rubber, 100% Polyurethane NameConcrete Pump Rubber GasketSizeDN50 (2inch) DN80 (3 inchDN100(4inch) DN125(5 ... and types upon requestMaterialPolyurethane, Natural rubberApplicationUsed in concrete pump truck,concrete pump and pipeline connection seal in construction work equipmentService brandsSchwing ... , Kyokuto, Zoomlion, Sany and so on 5" Schwing Concrete Pump Rubber Ring