Pouring rings for Duran^® laboratory bottles

Pouring rings for Duran^® laboratory bottles, GL 45 neck thread, blue polypropylene

Pouring rings for Duran^® laboratory bottles, GL 45 neck thread, red melamine resin

Pouring rings for Duran^® laboratory bottles, GL 45 neck thread, colorless

Pouring rings for Duran^® laboratory bottles, GL 32 neck thread, red melamine resin

Pouring rings for Duran^® laboratory bottles, PTFE, neck thread GL 80