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Inoculation/Filter Port Lid For Mushroom Spawn Jars

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Product Details

This pre-assembled and reusable lid fits a "widemouth" mason jar (90mm), and is equipped with a heavy duty self healing injection port, and a 0.2 micron filter.

The self healing injection port makes inoculation almost error-proof, while the 0.2 micron filter port keeps contaminants out of your mushroom spawn jar but allows adequate air & gas exchange for optimal colonization speed.

These lids are reusable and can be sterilized several times without warping or deforming. All components are 100% autoclavable.


  • Ball brand, reusable, heavy-duty, leak proof canning lid
  • Heavy duty injection port (grey rubber port) which is able to withstand repeated injections
  • 0.2 micron filter port (green port) for air/gas exchange

Injection ports and filter can be replaced when needed.

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