Easy Fermenter Fermentation Lids Kit, Mason Jar Airlock Lid for Wide Mouth Mason Jars, Pack of 4 Review (2026)

What this kit is and who it suits

Easy Fermenter's lids kit is a pack of 4 airlock lids built for wide mouth mason jars, aimed at home fermenters who want to run kraut, kimchi, pickles and hot sauce mashes without buying dedicated crocks or vessels. Because you supply the jars, this suits anyone who already has a shelf of wide mouth mason jars and wants to put several of them into active fermentation at the same time rather than committing to one large crock. The lids are made from food-safe plastic with a gasket designed to create an airtight seal once twisted onto a jar. It is a practical pickup for someone scaling up from a single trial jar of sauerkraut to a small rotation of batches running in parallel.

How the airlock lid works

Each lid in the kit uses a one-way airlock built into the plastic top, so carbon dioxide produced during fermentation can vent out of the jar while outside air, mold spores and fruit flies are kept from getting back in. That seal is what lets a ferment sit undisturbed on a counter for days or weeks without needing to be burped by hand. The leak-proof gasket around the rim is what makes the seal airtight once the lid is twisted onto a standard wide mouth mason jar. Because the kit ships as four lids, you can keep several jars sealed and fermenting on the same schedule, which is useful if you like to stagger batches of kraut, pickles or kimchi through the week.

Setting it up and living with it day to day

Getting started just means packing vegetables and brine into your own wide mouth mason jars, twisting on the airlock lid, and leaving the jars somewhere at room temperature out of direct sun while the airlock does the venting. Because there is no timer or gauge built in, you are still relying on taste and the general fermentation windows you would use with any jar ferment, typically checking in after a few days and again after a week or two depending on the recipe. One thing to plan around is that this kit does not include fermentation weights, so shredded vegetables can float up above the brine line unless you add your own weight, a small plate, or a clean rock to hold them down.

Where it fits against other lid kits

Against the Fermentology Sauer System, which ships with grommets, gaskets and stoppers so you can swap a lid between active airlock mode and a sealed storage mode after fermentation finishes, the Easy Fermenter kit is simpler and more single-purpose, built just to run the ferment rather than double as a storage lid. Compared with Jillmo's stainless steel airlock lids, which use metal rather than the mostly plastic build here, Easy Fermenter leans on a well-known name in the mason jar fermentation space and a straightforward four-lid pack rather than extra hardware. Either alternative is worth a look if you specifically want a storage-mode lid or a metal build.

Verdict and who should consider other options

For anyone who already owns wide mouth mason jars and wants an easy, no-fuss way to seal several of them for active fermentation, this four pack from a recognized name in the category is a sensible pickup. It is less suited to anyone using regular mouth jars, since these lids will not fit, or to anyone who wants weights included in the box rather than sourced separately. Shoppers who want a kit that also converts to a sealed storage lid after fermentation, or who prefer stainless steel hardware, should look at the Sauer System or a metal airlock kit instead.

Frequently asked questions