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0.2 Micron Syringe Filter Ports
This 0.22µm Syringe Filter port works excellently to allow adequate gas exchange for a liquid culture or grain spawn, while blocking out the vast majority of potential contaminants.
This port can be installed in a Mason Jar lid (or any jar lid) by drilling a 5/32" hole and inserting the small end of the filter port snugly into the hole. To be even more sure of an air/watertight fit, seal around the hole with high heat silicone.