Caps, Screw Top, with PTFE / Silicone Rubber / PTFE Septa, fitted in "knurled", polypropylene, Black Caps. For use with 13-425mm thread, 15x45mm autosampler vials. MicroSolv Brand. 100/PK.
Use with 15x45, 4ml autosampler vials. Used with older Waters and Shimadzu autosamplers. Designed to provide extra cleaning when "wiping" a needle, also provides a small degree of better resealing after injection compared to Silicone Rubber / PTFE Septa.