concrete pump pipe cleaning ball is mainly used for cleaning all kinds of diameter of pump pipe cleaning tool, maintenance of pipeline cleaning, made channel is more unblocked, unimpeded. Product name  Concrete Pump Cleaning Ball Size  DN50 (2inch) Soft, Medium, Hard OD=60mm DN80 (3inch) Soft, Medium, Hard OD=95mm DN100(4inch) Soft, Medium, Hard OD=124mm DN125(5inch) Soft, Medium, Hard OD=150mm DN150(6inch) Soft, Medium, Mard OD=175mm Other size you need, we can customized for you. Brand  Used