12 Pack of Regular Mouth Mason Jar Lids with Injection Port & Filter

12 pack of "Regular Mouth" 70mm mason jar lids with sealing ring to ensure it will be air tight and leak proof. Lids come with injection port and filter already placed. Injection port is a self- healing material which is perfect for preventing contaminating cultures. The filter is a synthetic 20mm filter paper which can filter 0.3 μm objects.**Does not come with mason jar lid ring.**