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

24MM Screw Neck PP Caps with Center Hole

Aijiren’s screw PP cover for sample storage vial is made of high-quality polypropylene. The color is usually black and white. You can choose whether to have a cap with a center hole. A cap with a center hole will make it easier for the syringe to be in the vial. Inject the sample or withdraw the sample.

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