SUCOHANS 100 peices Mushrooms Self Healing Injection Ports, 20mm Rubber Bottle Stoppers, for 13 mm (0.51in) Diameter Opening Mason Jar Lids

(20mm rubber stoppers)Vial Rubber Bottle Stoppers Self Healing Injection Ports.
self healing injection ports for mason jar lids.
fit 13 mm (0.5118'') diameter opening (100)
Rubber Bottle Stoppers Self Healing Injection Ports for Mason Jar Lids
use a 7/16 to 1/2 inch drill bit and drill a hole in metal or plastic jar lid and the stoppers pop right in place.
stoppers can be used to make self-healing injection ports in Mason jar lids or medicine bottles.
Mainly used for mushroom growing and liquid culture production. Use with hypodermic needles to inject cultures, therefore never needing to remove the lids on your culture jars.
3/4" across the top, and 5/16" top to bottom.
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