... ,vacuum cleaner,air condition ◊ Appearance · corrugated hose with smooth cover.· distance average between each ripple.· no flaw, poison, smell.· flexible, soft, bend naturally. ◊ Technical ... ) 2) ROHS / SGS (European environmental protection ) 3) ISO9001:2008 soft , flexible ,no-odor PVC suction hose , PVC corrugated hose