This pre-assembled and reusable lid is equipped with a  heavy duty injection port, and a 0.2 micron filter.
 
Designed to keep contaminants out of either a mycelial or liquid culture, while allowing adequate air exchange. These lids can be sterilized between uses in a pressure canner at 15psi. All components are 100% autoclavable. 
 
This product fits a wide-mouth (90 mm) mason jar.
 
Made with the highest quality materials:
-Ball brand reusable canning lid
-heavy duty injection port which is able to withstand repeated injections
-0.2 micron filter for air exchange
 
Injection ports and filter can be replaced when needed.