... , good stability, convenient operation, high yield.Our concrete pipe making machine adopts variable frequency motor,which can help you ... frequncy motor:can help you save 40% power 1,Suspension roller type concrete pipe making machine2,Mould:flat,socket,rabbetdiameter: ... informations, thanks for your cooperation.1, the pipe length2, the pipe inner diameter3, the pipe joint, flat, socket or rabbet? 4,If ...