Material:food grade Polypropylene
0.22um PTFE Syringe Filter & 20mm Self Healing Injection Ports
Fits all Wide Mouth Mason Jars
Lids can be used in microwave, pressure cooker or autoclave.
Professional grade autoclavable jar lids are lab-quality, and specifically made for liquid culturing .
Leave lids a quarter turn loose while in pressure cooker to allow air to escape, otherwise injection ports will pop out.