Enable rapid identification by using Thermo Scientific™ Nalgene™ HDPE High Profile Closures with Color Coders for Micro Packaging Vials. Closures have no O-ring to fall out or contaminate contents and are free of toxic heavy metals. Permanently attached color coded inserts do not come in contact with vial contents. Vials (listed separately) and closures are pressure-tested together at 7.5psig.