Mininert™ Valves

Mininert® push-button valves are highly dependable, leak-tight closures for screw-cap vials and other laboratory containers. Their unique features make Mininert valves the ideal closure for calibration standards, air- or moisture-sensitive fluids, derivatizing reagents, or volatile chemicals. When used with a glass vial, only PTFE and glass are in contact with the contents. 

  • Leak-tight closure with syringe access
  • Models for virtually any laboratory glassware
  • Replaceable septum
  • Simple installation

Operation is extremely simple - push the green button to open the valve, insert the needle through the septum and take a sample, withdraw the needle, and push the red button to close the valve.

  • Screw-cap Mininert valves for vials are available in a variety of sizes. The crimp-top valve for 13 mm ID glassware slides into the neck of the vial and features a threaded flange which is turned to provide a leak-tight fit.
  • Mininert valves with standard tapers for laboratory use brings Mininert convenience and ease to a variety of applications using standard laboratory glassware such as reaction chambers, test tubes, and other glass systems. 
  • Mininert valves with threaded fittings offer positive on/off fluid control as an in-line valve or syringe access as a termination valve at a sample point.
  • Mininert Syringe Valve for Series C or D syringes are a convenient add-on that allow our Series C and D syringes to store samples at up to 250 psi. The valve body is all PTFE, with a stainless-steel stem.
  • Mininert Syringe Valves for Luer-tip syringes are designed to fit Luer-tip syringes from any manufacturer and accept traditional Luer needles.

VICI also offers replacement silicone septa to fit all Mininert valves, and an installation tool, a handy device for quickly removing and replacing needle seal septum.


Mininert valves can be used at temperatures up to 105° F. However, after use at high temperatures, the valve may leak slightly when cooled to room temperature.


Mininert valves are made from PTFE, which is highly inert and may be used with most common materials. It is particularly useful for working with most acids and organic solvents. However, problems may be encountered when used with organometallics and some strong bases. We recommend actual exposure tests before use with any material.


The sealing ability of Mininert valves is more than adequate to contain most volatile liquids and gases at low pressures. Mininert valves have been used at pressures as high as 120 psi without leakage, but it is not recommended to pressurize glass containers to these levels. Such pressurization of glass containers can be extremely dangerous.