PM DN125 rubber sponge ball for pipe cleaning Concrete Pump Cleaning Ball size from 1''-8'', soft, ... 8'', soft, medium, and hard available.Main Products: pump pipe,concrete pump elbow80mm-150mm sponge rubber ball for cleaning pipesponge rubber ... rubberapplacationcleaning the pipeline of concrete pump and concrete pump truck in construction work equipment PM DN125 rubber sponge ball for pipe cleaning