12 Wide Mouth Lids with Injection Port & 0.3μm Filter Patch, reliable high quality mushroom grain spawn lids.

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Pack of twelve wide mouth spawn jar lids.

These wide mouth 86mm mason jar lids have a 20mm synthetic and breathable material (EPTFE) that is waterproof and resistant to contaminants up to size 0.3 µm. They utilize a high quality rubber injection port that can withstand repeated use unlike those cheaply made black stick on ports that fail after one use.
𝐌𝐚𝐬𝐨𝐧 𝐣𝐚𝐫𝐬 𝐚𝐧𝐝 𝐫𝐢𝐧𝐠𝐬 𝐚𝐫𝐞 𝐧𝐨𝐭 𝐢𝐧𝐜𝐥𝐮𝐝𝐞𝐝 but can be purchased at your local big box store.