... china. Our products include steel pipes, rubber hoses, elbows, bends, reducers, couplings, cleaning balls and so on.2. As a ... ZHONGLING concrete pump cleaning ball specification:- sponge balls from 2" to 8", soft, medium or hard- sponge colume 4", 5" and 6"- ... , Zoomlion,Schwing,CIFA and so onPICTURE Concrete Pump Cleaning Balls/Cylinders DN125 5'' Concrete pump clean-out ball,sponge rubber ball