Injection Ports & Synthetic Filter Discs

One pack comes with 6 self-healing injection ports and 6 micro pore filters. (Makes 6 modified jar lids)
The synthetic filter disc can withstand sterilization temperatures and pressures. Rated to 0.3 μm and can ensure the circulation of internal and external air.
To make your own modified lids, just drill (2) 1/4 inch holes at opposite sides of your jar lid. Put the filter sticker, centered over one hole, and push the injection port through the other hole, working it all the way in place, as seen from the bottom side of the lid.
I find that for plastic lids, this works perfectly and that no messy silicone sealant is needed.