Caps, Screw Top, with Silicone Rubber / PTFE Pre-Slit, 40mil Septa, bonded in wide mouth, "knurled", polypropylene, Black Caps. For use with 10-425mm threads, 12x32mm autosampler vials. BASIK Brand. 1000/CS.
Pre-slit for easy penetration by autosampler needles.
This Septa is slightly thinner than most Septa to enhance the ease or needle penetration. 40mil equals 1.016mm.
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