Pack of 10 injection ports.
(Use a size 13/32 step drill bit)
These are autoclavable and will withstand the high temperatures of a pressure cooker.
They are self healing, heavy duty and able to withstand repeated use with a syringe needle.
Don't jeopardize all your hard work using cheap mushroom culture injection ports, use these trusted injection ports and rest assured knowing your cultures are securely sealed from contamination entering your jars.