13mm Vial Rubber Stoppers are For a 7 mm or 1/4 inch diameter hole opening.Suitable Size of Self Healing Injection Ports can Increased Sanitary Conditions.
Excellent Heat Stability (butyl rubber) -Self Healing Great for Liquid Culture,injection, Supplemented substrate jars, Grain Masters
Self Healing Injection Ports For Mason Jar Lids:Great for liquid culture,injection, Supplemented substrate jars, Grain Masters