3.0mL Micro-Vial, Accuform Borosilicate Glass, Screw Thread, Graduated, Open Top Closure (attached) 20mm–400 12-pk. 21051 Mininert® Precision Sampling Valves for Vials Mininert® valves are very convenient for repetitive sampling and limit content exposure to the silicon sep-tum. Models are available for screw-cap and crimp-top vials. The