3 REGULAR, Grommeted Plastic SteriKAP's Plus 3 SteriLOCK Food Fermentation Airlocks

They're not the cheapest but I really like these Stericaps! They are perfect for my standard mouth (not wide mouth) 1 litre Kilner jars. I ferment kimchi, krauts, kvass, chillis and hot sauces. The lids fit well and the valves work perfectly. I have never once had an issue with unwanted microbes getting in or spoilage. They make fermenting so much easier, as you don't have to burp your jars or worry about messy spillage from CO2 buildup. They're easy to clean and mean I can discard the standard KIlner jars metal lids, which always get rusty and corroded.

Does not fit a regular sized jar

These plastic lids with inbuilt valves for letting CO2 out, fit both standard UK Kilner and U.S. Ball jars. While the lids are not tight fitting, enough of a seal exists so that CO2 gas can escape and oxygen from the air stays out. This creates a controlled environment that reduces the risk of the 'wrong' kind of off-tasting bacteria/yeast/mould from growing on the surface of whatever you are pickling or preserving inside the jars. Lids have a low 'overhead' height, making for a good vertical fit in the fridge and they clean up easily after use. Recommended.

Work well. Looks like a bit of filter paper keeps dust and bugs out. Need to ensure material 3cm from filter or liquid will ruin airlock effect

Great little lid and just perfect for the emmy jars from pound land. I use mine for fermenting and kefir and they do the job perfectely.

These lids are a great they fit my Kilner jars and ball jars very pleased.

Cheap, one lid was misshapen, thrown in the pack in a Jiffy bag, not sealed to say they are for food, and expensive and instructions and guide is a printed internet page, would look elsewhere for more.

These were ordered to fit onto my kilner glass jars but they didn't fit. They are still a great product however and they arrived the next day which was a real surprise, thank you so much. Perhaps more detail could be provided in the listing to make it clear that these won't fit all kilner glass vessels and for this reason I didn't give it 5 stars.