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Red butyl injection port
Little red butyl injection ports for your spawn jar lids.
Making a lid hole is easy, use a stepper drill bit and not a normal bit, otherwise your lid will turn into a propeller when you start drilling. Go slow, the hole needs to be 8mm to fit your stopper in neatly (slightly bigger works too). Then carefully glue into place using RTV silicone and let dry for as long as the instructions say.
Now you can poke with a syringe.