Rubber Injection Ports Steam Sterilization Safe 13mm/0.5118" for culture bottle
Rubber Bottle Stoppers Smaller for Increased Sanitary Conditions silicone injection port
13mm rubber stoppers are for a 7 mm or 1/4 inch diameter hole opening
Excellent Heat Stability (butyl rubber) self healing Great for liquid culture, BRF Jars, injection, Supplemented substrate jars, Grain Masters
self healing injection ports for mason jar lids:Great for liquid culture, BRF Jars, injection, Supplemented substrate jars, Grain Masters