Screw Thread PP Caps with Center Hole
https://www.hplcvials.com/products/8-60ml-epa-storage/24-400.html

Screw Thread PP Caps with Center Hole

These polypropylene caps have excellent sealing characteristics and offer good chemical resistance including acids, alcohols, alkalis, aqueous products, cosmetics, and household oils. Polypropylene Hole Caps are known for good impact strength, cost effectiveness, and pliability. Septa sold separately.

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