100Pcs Rubber Glass Stopper Self Healing Injection Ports Inoculation For 13mm Opening

Specification Material: Butyl Rubber Color: Grey Diameter: 20mm /0.79(appr.) ? Features 1.Provide bottle a tight seal with this snap-on stopper 2.Material of durable butyl rubber, good heat stability. 3.Rubber Bottle Stoppers Self Healing Injection Ports. 4.Designed for a 13mm or 1/2 inch diameter hole opening. 5.Widely used for liquid culture, BRF Jars, Supplemented substrate jars, Grain Masters. ? Package included 100 X Injection Ports