... certificate 2 flexible tranparent,non-toxic,resist UV,bend into a circle 3 temperature-20--80 degree PVC Spiral ... condition ◊ Appearance · corrugated hose with smooth cover.· distance average between each ripple.· no flaw, poison, smell.· flexible, soft, bend naturally. ... ROHS / SGS (European environmental protection ) 3) ISO9001:2008 soft , flexible ,no-odor PVC suction hose , PVC corrugated hose