... : soft,mebium soft,hard 3.Color:red,green,blue,orange Detailed Product Descriptionconcrete pump cleaning ball it is for cleaning concrete pump ... pipes and parts in china. Our products include steel pipes, rubber hoses, elbows, bends, reducers, couplings, cleaning balls and so on ... Pump Cleaning Balls/Cylinders DN125 5'' Concrete pump clean-out ball,sponge rubber ball