DescriptionDURAN® Pouring ring GL 45 , ETFE, red, for DURAN® laboratory glass bottles with DIN thread SpecificationsFeaturesDocuments DURAN® Pouring ring GL 45 , ETFE, red, for DURAN® laboratory glass bottles with DIN thread Neck GL45 Thickness (w1) - mm 4 For chemical and thermal resistance, see our chemical and thermal resistance page. Peroxide cured silicon High leak tightness through use use of PTFE coated silicone seal. More chemically resistant than PP screw cap. A matching ETFE pouring ring is also available, permitting clean, drop-free use.