Caps, Screw Top, with Silicone Rubber / PTFE Pre-Slit Septa, fitted in "knurled", polypropylene, Black Caps. For use with 8-425mm thread, 12x32mm autosampler vials. BASIK Brand. 100/PK.
Wider hole for use with narrow mouth, 2ml vials. Wider hole provides a larger target area for the autosampler needle during injection.
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