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

Black PP Caps with Center Hole

Caps for screw thread vials are available with either an open hole for autosampler use and standard addition or with a solid top for sample storage. One piece polypropylene cap and membrane are also available. These pierceable screw thread caps are designed for one time use and reduce sample preparation time as there is no cap and seal to assemble.

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