... Materials: S/S, Brass, Rubber Items can be customerized ISO9001: 2000, ISO14001:2004, CE Metal flexible hoseDN15~65mmMaterials ... : S/S, Brass, RubberItems can be customerizedISO9001: 2000, ISO14001:2004, CE1)Used for fresh air fan ... Notable vibration absorbing, noise reduction;2) Manufacturer, ISO9001: 2000, ISO14001:2004 and CE certificated, having 25 years experience ...