... produce vacuum stretch hose,industrial hose,wire conduit,corrugated hose,ventilation hose,PVC hose,PU hose, ... wire conduit,corrugated Materials: Outer bore(Wall): High quality soft PVCReinforcement: High intensity PVC coated spring steel wire,corrosion resistant. ... Techniques:Bow mould,injection mould,extrusion,spiral,corrugated and so on. Features: ...