... wears plate Cutting ring, S pipe swing valve,concrete pump piston hydraulic transmission cylinder seals repair package and rubber pieces ... company's newly-operation production line of medium-frequency concrete pump reducer pipe can produce 20 #, 35 #, J55 wear- ... meters of the reducers. Our company's main apportion concrete pump brands: China Zoomlion, China Sany Heavy Industry, PM (Putzmeister), ...