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. 1000/CS.
Wider hole for use with narrow mouth, 2ml vials. Wider hole provides a larger target area for the autosampler needle during injection.
Click HERE for smaller pack quantities