12 Lids for Making Mushroom Grain Spawn. These lids fit wide mouth mason jars. They’re made of polypropylene and come with a self healing injection port, filter plug and a silicone gasket. You are going to receive 24 extra filters, but I also sell packs of 100 replacement filters for when you wish to have more. They’re Protected to make use of within the microwave, pressure cooker or autoclave. These lids are the worth version of my other lids of this sort. They’re made with inexpensive generic brand lids. Mason Jars NOT Included!
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Pressure Cooker Protected
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