... Concrete Pump pipe Cleaning Balll size from 1inch-8inch, soft, medium, and hard available, usding for Schwing, PM, NameConcrete Pump ... Cleaning BallsizeDN25(1inch) soft ,hard ,medium softDN50(2inch) soft ,hard ,medium softDN80(3 inch) soft ,hard ,medium softDN100(4 inch) soft ,hard ... , PM, Kyokuto, CIFA, Sany, Zoomlion, and so on DN125 Soft/Medium/Harden Concrete Pump Cleaning Rubber Ball