Caps, Screw Top, with PTFE Septa, fitted in "knurled", polypropylene, Translucent Caps. For use with 9-425mm thread, 12x32mm autosampler vials. MicroSolv Brand. 100/PK.
Rubber-free Cap is useful when rubber cannot be used with your analysis.
This PTFE (only) Septa is for single injections or non-volatile samples as it will not reseal