... .Material: Natural Rubber Concrete Pump Cleaning Ball Sponge Ball SpecificationsNameSponge Cleaning BallSize (mm)DN 50/80/100/125/150/180 ... Yellow, Blue, Green, etc.ApplicationCleaning the pipeline of concrete pump and concrete pump truck in construction work equipment. Sponge Ball Technological ... in Rubber & Plastic auto parts for more than 10 years, covering spiral wrap,rubber hose,rubber seal strip ...