Caps, Screw Top, Solid, with a Red-Orange Silicone Rubber / TEF liner, in "knurled", closed Black Caps. For use with 10-425mm thread,12x32mm autosampler vials. MicroSolv Brand 100/PK.
Use with wide mouth autosampler vials. The Silicone Rubber / TEF liner provides a very good seal for longer term storage in autosampler vials.