sucohans 100 peices mushrooms self healing injection ports, 20mm rubber bottle stoppers, for 13 mm (0.51in) diameter opening mason jar lids sucohans <p>20mm self healing injection ports for mason jar lids</p> <p>■20mm rubber stoppers-vial rubber bottle stoppers self healing injection ports,fit 13 mm (0.5118’’) diameter opening (100)</p> <p> rubber stoppers:3/4” across the top, and 5/16” top to bottom.</p> <p>■install instruction</p> <p>(1)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.</p> <p>(2)stoppers can be used to make self-healing injection ports in mason jar lids or medicine bottles.</p> <p>■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.</p> <p>self healing injection ports/ injection ports /injection port self healing ports/ silicon injection port /silicone injection port /vial stoppers /stoppers rubber /vial stopper /mason jars self healing /silicone ports injection ports/ 1/4 in self healing ports /injection ports /self healing injection ports/ vial stoppers /self healing rubber injection ports /self healing injection port /20ml vial stopper /silicon injection port /self healing injection ports /10ml vial stopper injection port /self-healing injection ports /stoppers rubber /self healing port /self-healing rubber injection ports/ self healing injection ports for mason jar lids</p>