... red,green,blue,orange Detailed Product Descriptionconcrete pump cleaning ball it is for cleaning concrete pump pipe model: DN25 to DN ... shotcrete machines.4. OEM available from us.ZHONGLING concrete pump cleaning ball specification:- sponge balls from 2" to 8", soft, ... ,Schwing,CIFA and so onPICTURE Concrete Pump Cleaning Balls/Cylinders DN125 (5'') Concrete pump sponge clean-out ball,soft Medium Hard