13mm rubber stoppers/Vial Rubber Bottle Stoppers Self Healing Injection Ports. Fit with  1/4 inch or 7mm hole opening. 

13mm Rubber Stoppers

$0.00Price
    • fits for 7 mm or 1/4 inch diameter hole opening
    • Smaller size makes it more sanitary and easy to use and easier than bigger rubber stoppers
    • Great for liquid culture, BRF Jars, injection, Supplemented substrate jars, Grain Masters .stoppers can be used to make self-healing injection ports in Mason jar lids or medicine bottles.
    • 100% Autoclavable