Mininert Precision Sampling Valves for Vials – Restek. Models are available for screw-cap and crimp-top vials. The crimp-top valve for 13 mm ID glassware slides into the neck of the vial. Inserts for 2.0 mL, 11 mm Crimp-Top, 2.0 mL, 9 mm Short-Cap *Big Mouth insert w/glass flange (step design) not to be used with 9 mm screw-thread vials. If