laffeya Fermentation Lids Kit - Wide Mouth Mason Jar Fermenting Lids with Airlocks and Grommets, Stainless Steel Review (2026)

What it is

This is a fermentation lid kit from laffeya built around stainless steel lids sized for standard 86 millimeter, or about 3.38 inch, wide mouth mason jars. This particular listing includes two complete sets, each with a lid, a water airlock, and the silicone grommet and ring needed to seal it. The stainless steel construction is a step up from the plastic lids used in some budget fermenting kits, since metal resists staining and odor absorption from brine better over repeated use, and it holds its shape rather than warping under a tight seal.

Fit for the job

The water airlock design is the same general approach used across most fermentation lid kits: a small reservoir of water lets fermentation gas bubble out while blocking outside air and contaminants from getting back in, so there is no need to manually loosen and re-tighten a lid to release pressure during active fermentation. Fitting 86 millimeter jars means this kit is compatible with the Ball and Kerr wide mouth mason jars most American home fermenters already own, so there is no need to buy specialty jars to use it. With two sets included, it suits someone running one or two jars rather than a full batch across many jars.

Build and materials

Stainless steel lids paired with silicone rings and grommets is a durable combination, and the parts are designed to be reusable across many fermentation cycles rather than replaced each time. The silicone grommet seals around the airlock port specifically, which is the part most likely to wear or lose its seal over time on any lid of this style, so it is worth keeping an eye on that component's condition as the kit ages. Because this is a smaller two-set kit, buyers who want to convert several jars at once should check the exact piece count on the current listing, since laffeya also sells larger four and six set versions of a similar kit.

Value

For someone with just one or two mason jars they want to convert into fermentation vessels, this smaller kit avoids paying for a larger multi-jar set they would not fully use. Stainless steel construction also means the lids should outlast cheaper plastic alternatives, so the per-use cost over several years of fermenting is reasonable even though the upfront price per lid is a bit higher than a basic plastic kit. Buyers planning to ferment several jars simultaneously should compare the per-lid cost against laffeya's larger kits, which typically bring the cost per set down.

Who should buy it

This fits home fermenters with a small setup, someone making one jar of kraut or kimchi at a time, or anyone wanting to try fermentation before committing to converting a whole shelf of jars. It is a reasonable upgrade from plastic lids for anyone who already owns wide mouth mason jars and wants a sturdier metal option. Buyers planning larger batches across several jars at once should look at laffeya's bigger multi-set kits instead, since this specific listing is sized for just a couple of jars. It is also a sensible low-commitment way to test whether the water airlock style suits your routine before buying enough lids to cover a full shelf of jars.

Frequently asked questions