... 5", 100% brand-new rubber, 100% Polyurethane Exact size, OEM availabl NameConcrete Pump Spare Parts--rubber sealing ringSizeDN50 (2inch) DN80 ... types upon requestMaterialPolyurethane, Natural rubberApplicationUsed in concrete pump truck,concrete pump and pipeline connection seal in construction work ... Cifa, Kyokuto, Zoomlion, Sany and so on Concrete Pump Spare Parts--rubber sealing ring