Will these work for making kefir?

If making Kefir requires a fermentation process, and the vessel you make it in fits the silicone top the. Yes, it will work fine. I’ve started putting mine in the dishwasher( top rack only) to. Lean them before using them. Pretty good product.

Does this stay on securely enough that I could shake a drink with ice in a mason jar using this lid?

I just tried it! I filled the quart jar 1/2 full of ice, filled it to the neck with water, put the lid on and shook it over the sink briskly. It worked fine, but I would use caution still. Mine are new as well so I'm not sure about it over time. My kim chi loves them...

Can these be used for sous vide?

I don’t know. I use for sourkraut

Can these lids be used in F2 when making Kombucha?

Yes if it’s the same size container. Events fermentation, gases well.

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SOPHICO Silicone Airlock Ferment Lids Pickle Kit for Wide Mouth Mason Jar

Product ID: 684790655

Details

Brand
SOPHICO
Colour
MIX-WIDE MOUTH
Material
Plastic
Shape
Round
Style
jar can

💨Waterless one-way airlock valve

🧼Dishwasher safe for effortless cleaning

🛡️100% Food-grade BPA-free silicone

Description

🥒 Unlock the power of effortless home fermentation—fresh probiotics, zero fuss!

HASSLE FREE CLEANUP - Dishwasher safe lids make post-fermentation cleanup a breeze.
DURABLE SAFE MATERIAL - Made from premium BPA-free silicone that resists wear, fading, and deformation.
BEGINNER FRIENDLY DESIGN - Perfect for pros and newbies alike—no extra lids or pumps required.
VERSATILE WIDE MOUTH FIT - Fits standard wide mouth mason jars for fermenting everything from kimchi to pickles.
EFFORTLESS FERMENTATION CONTROL - Self-burping airlock vents gas automatically—no burping or water needed.

The SOPHICO Silicone Airlock Ferment Lids are premium, BPA-free silicone caps designed exclusively for wide mouth mason jars. Featuring a waterless one-way valve, these self-burping lids automatically vent fermentation gases without any manual burping or water refills. Ideal for beginners and seasoned fermenters, they support a variety of fermented foods like kimchi, pickles, and sauerkraut. Durable, dishwasher safe, and easy to use, this 4-pack kit transforms your kitchen into a probiotic powerhouse with minimal effort.

Specifications

ASIN	B09NPGLRN3
Best Sellers Rank	#1,689,859 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #42,447 in Jars & Containers
Brand Name	SOPHICO
Closure Type	Twist Lock
Colour	MIX-WIDE MOUTH
Customer Reviews	4.5 4.5 out of 5 stars (901)
Included Components	Fermenting Lids
Is the item dishwasher safe?	Yes
Is the item microwaveable?	Yes
Item Highlight	for Pickles, Kimchi, and Fermented Probiotic Food, Waterless Airlock Cap, for Wide Mouth Mason Jar(4 pack)
Manufacturer	SOPHICO
Material Type	Plastic, Silicone
Model Number	WIDE MOUTH
Number of Pieces	4
Product Style	jar, can
Shape	Round
UPC	612677839335
Unit Count	4.0 Count

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