... high-and-low-pressure pipes have materialsQ23520#16MnST5237Mn5, siphon, adjustable tube, precision steel tubes card 3-5 meters highpressure rubber ... Cutting ring, S pipe swing valve,concrete pump piston hydraulic transmission cylinder seals repair package and rubber pieces of nylon, ... produce 20 #, 35 #, J55 wear-resistant materials concrete pump adjustable tube, can produce from 1 m to 3 meters of ...