Caps, Screw Top, with Silicone Rubber / PTFE Pre-Slit Septa, bonded in "knurled", polypropylene, Black Caps. For use with 13-425mm thread, 15x45mm autosampler vials. MicroSolv Brand. 1000/CS.
Pre-slit for easy penetration by autosampler needles. Recommended for older Waters® instruments. Use with 15x45mm, 4ml vials.
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