... high yield.Our concrete pipe making machine adopts variable frequency motor,which can help you save 40% power,lower noisy .Itcan ... frequncy motor:can help you save 40% power 1,Suspension roller type concrete pipe making machine2,Mould:flat,socket,rabbetdiameter ... following informations, thanks for your cooperation.1, the pipe length2, the pipe inner diameter3, the pipe joint, flat, socket or rabbet? ...