9mm Screw Caps for 9mm HPLC Vials
https://www.hplcvials.com/products/1-4ml-hplc-uplc-gc/9mm.html

9mm Screw Caps for 9mm HPLC Vials

Polypropylene screw cap with septum – Polypropylene screw cap with precision fit septum provides anti-evaporation seal. Two layers include silicone and PTFE. Silicone septum for multiple injections. PTFE lining screw cap for organic samples. The screw cap provides an inert airtight seal and holes directly into the sample with a needle.

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