Concrete Pump rubber seal 2"/3"/4"/5", 100% brand-new rubber, 100% Polyurethane Exact size, OEM available. NameConcrete Pump rubber sealSizeDN50 (2inch) DN80 (3 ... rubberApplicationUsed in concrete pump truck,concrete pump and pipeline connection seal in construction work equipmentService brands Schwing, PM, Cifa, Kyokuto, Zoomlion ...