... diameter between 200mm to 500mm,length 1-2m5.Joints including socket and spigot,male and female,plain or other types6. ... pcs dailyAdvantages of Suspension roller technology1.Adopting dry concrete,to make structure of pipe wall well-distributed,high compressive strength2.With ... -43-43-43-4JointPlain,socket and spigot,male and femalePlain,socket and spigot,male and female Plain,socket and spigot,male and ...