1 PU,TPU or PVC spiral hose 2 Hose for absorption ,transfer,transportation use hose and duct 3 Hose used as ... air ventilation Absorption hose,transfer hose,transpotation hose Materials: Polurethane,PU,TPUFeatures: 1 ... and warm air duct, air conditioning system, industrial vacuum cleaners; Absorption hose,transfer hose,transpotation hose