... ''/4''/5''/6''/7''/8'' 100% brand-new rubber, 100% Polyurethane NameConcrete Pump Rubber GasketSizeDN50 (2inch) DN80 (3 inchDN100(4inch) DN125(5 ... , Natural rubberApplicationUsed in concrete pump truck,concrete pump and pipeline connection seal in construction work equipmentService brandsSchwing, PM, Cifa, Kyokuto, Zoomlion ...