VWR Stopper Neopr Grn 5.5 PK22

VWR Stopper Neopr Grn 5.5 PK22. 5 mm Natural Elastic Polymer (neoprene) stopper is supplied as standard with all new VWR Autoclavable Stoppers however these new stoppers have an elastomer lining and are ideally suited for use with flexible jars and flasks with necks that have been widened. The urethane lining ensures that the stoppers will not leak even with active leak detection systems and provides added comfort during the blowing stage of distillation procedures. The urethane stoppers utilize