9mm Screw Thread Caps from Aijiren
https://www.hplcvials.com/products/1-4ml-hplc-uplc-gc/

9mm Screw Thread Caps from Aijiren

Polypropylene Screw Cap with Septa – Polypropylene screw cap with precision-fit septa provide an evaporation-proof seal. Bi-layer include silicone and PTFE. Silicone septa for multiple injections. PTFE-lined screw cap for organic samples. Screw caps provide an inert, airtight seal and direct puncture-access to samples with a syringe needle.

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