• Available in 38-430 finish
• Natural HDPE closures are ADFC (Animal Derived Component-Free)
• Fits Nalgene PET and PETG Media Bottles with 38-430 neck finish (except 125mL PETG Media Bottles)
• Leakproof Guarantee when used with Nalgene PET and PETG Media Bottles
• Easy application and breaking of the tamper evident seal ring
• Gamma irradiated to provide 10⁶ Sterility Assurance Level (SAL)
• Flat top surface for possible printing or labeling

Ordering Alerts:

Closures are sterile and bulk packed. Order Nalgene PET or PETG Media Bottles with 38-430 neck finish without closures separately. The term “leakproof” applies to Thermo Scientific Nalgene products that meet the following criteria: a) Bottle/flask/funnel closure systems with closures smaller than 100mm, after they are filled with water, inverted, withstand air pressure of 2psig for 2 minutes, and no water escapes;. b) Bottle/funnel/flask closure systems of larger than 100mm after they are filled with water, inverted for 15 minutes, and no water escapes. Note: these tests, using other liquids, may not yield the same results. To ensure safe usage, customers are advised to test Thermo Scientific Nalgene bottles and closures under conditions of their planned applications. Thermo Scientific Nalgene products are leakproof at ambient temperature and pressure when used with their Nalgene closures.