... .Model:DN80,DN100,DN125,DN150,DN175,DN200 2.Mat:rubber 3.Color: White,Black Truck-mounted concrete pump partsWe are a ... ( adopt natural rubber) rubber hose:DN 125mm and DN 150mm ,3 or 4 meters,other sizes upon your request rubber piston ... concrete pump sealing rings Concrete pump sealing rings without lip(3'',4'',5'',6'',7'',8'',9'')