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Self Healing Rubber Injection Ports Steam Sterilization Safe 13mm/0.5118" for culture bottle 13mm Vial Rubber Stoppers are For a 7 mm or 1/4 inch diameter hole opening.Fits 13mm Bottles with 7mm opening. (100) Suitable Size of Self Healing Injection Ports can Increased Sanitary Conditions Self Healing Injection Ports For Mason Jar Lids:Great for liquid culture,Supplemented substrate jars, Grain Masters We use for liquid culture, test tubes and bottles. Its smaller size makes it more sanitary and easy to use and easier than drilling those big holes for the larger stoppers Vial Rubber Bottle Stoppers/Self Healing Injection Ports for Mason Jar Lids/self healing injection ports/ injection port self healing ports/vial stoppers/self healing rubber injection ports/