This soft plastic tube,transparent and innoxious,has steel ware﹛scr-ewly inserted in the PVC boby .It fits to the temperature range﹛of 10⊥-+65⊥.The characteristics of it are high in elastic,rub-resist and an excellent ability of resis- ting solvent(mostly are﹛chemical additive).It can be widely used in the vacuum pumps in farming,water- ing ,shipping ,oil chemical indu- stry ,plastic processing machinery and sanitary equipments for food- stuff ,ect.