Product Review

*6 pack of metal wide jar lids with rings included*

*Two air exchange holes with 0.2 microns Laminates of non-woven polypropylene with PTFE, give your mycelium enough fresh air and prevent any kind of contamination *

*20mm butyl self-healing rubber stopper for inject liquid mushroom cultures*

*They are reusable, highly durable*

High Pressure Cooking
When doing high pressure cooking, you need to loose lid about a quarter turn. Otherwise, the high pressue inside jar will push the stopper out.