Your cart is empty.
Fermenting is a science, and a bit of an art. It requires care in a few specific things, but doing it right is not particularly complicated. We provide instructions that are accurate to the best of our knowledge, and which are based on the methods we successfully practice ourselves. There are no guarantees of success or safety with fermented foods. While properly fermented foods are not only safe, but healthy to eat, it is up to you to follow instructions to ensure safety, and to trust your eyes and nose, and don't eat things that do not look or smell like food. We offer no guarantees of success with our product. We do warrant that it is as described, and will do what we say it will, but how you use it is your choice.
View as: 
Sort by:

Fermenta Lock Airlock Cap

Wide Mouth Compact Airlock Jar Lid. Fits standard Wide Mouth Mason Jars and other jars which accept the same size lid. Also available in other standard jar lid sizes. Each order includes: 1 Wide Mouth Fermenta Lock Airlock Lid and 1 Wide Mouth Storage Lid NOTE: Standard Mouth Fermenta Lock Caps are available by custom […]

Fermenta Dunk Food Weight

NOTE: Who would have thought that dunkers would be so hard to find, and so hard to keep supplies sufficient? It seems every time we order another batch, one more style has become unavailable. We are saving up for the equipment and supplies to manufacture our own dunkers, so we can keep the supply predictable, […]

Fermenta Fido Airlock Jar 1 QT


NOTE: Fido Valves are available. Order the regular replacement valves and email us to let us know you want the fido version. This item is currently made to order, turnaround time is about 2-3 weeks. The pickling jar EVERYONE wants! Fido canning jar with an airlock lid. Currently available in 1 qt size (other sizes […]

Fermenta Fido LID ONLY


We have had so many requests for Lids Only, that we are listing these separately. Standard FIDO Jar lid with Airlock Valve The majority of the cost of these are in the LID and the VALVE, so the price difference is not great. This item is Made to Order, and has a standard 2-3 week […]

Fermenta Sauce Chubby Airlock Lid and Jar


Finally! A narrow airlock jar for sauces and condiments! Includes 1 Square 16 oz Jar 1 Airlock Lid (with Fermenta Lock Valve) A complete set for fermented condiments and thicker sauces. The jar mouth is large enough to be able to use a spoon or knife to remove contents, but narrow enough to control pouring. […]

Wide Mouth Fermenta Lock and Dunker Bundle


Buy a Bundle and Save! An easier way to order Fermenta Lock and Fermenta Dunk together. Each order includes: 1 Fermenta Lock Airlock Cap 1 Plain Storage Cap 2 Fermenta Dunk Food Weights (may be round or square) 2 Dunker Extenders (Qt and Half Gallon) Please read full descriptions on the individual product pages, for […]

Fermenta Lock Soft Silicone Gasket

Wide Mouth Size (Custom sizes available through email.) A thick silicone gasket that makes mason jars completely airtight. Fits wide mouth mason jars and other jars with the same size lid requirements. May be used with Fermenta Lock Caps or with storage caps. Not recommended for use with canning. Special “grippy” design keeps the gasket […]

Fermenta Dunk Extender – Plastic Set

Plastic Extenders. Set of 2, ONE quart size, ONE half gallon size. Other sizes are available by custom order through email – gallon, and pint sizes. Colors Vary NOTICE! If you are ordering Dunkers, DO NOT order additional Extenders unless you really need them. Your Dunker order already comes with 2 Extenders. A flexible, semi-rigid […]

Fermenta Lock Replacement Valve

Replacement valve for Fermenta Lock airlock caps. This is the Yellow Valve ONLY. Does NOT include the Lid. Fits a smooth 1″ hole with a 1 mm thickness. This item is hand manufactured of food grade silicone, in the US. NOTE: If you want Fido Valves, or Crock Valves, order these valves, and email us […]

Fido Jar Replacement Gasket

White Latex FIDO replacement gasket. This is the SAME gasket supplied with Bormiolli Rocco Fido Jars – when people order a lid only, we have these as surplus. If you want a discount on a bundle of 12 or more of these, give us a holler and we’ll arrange an order by email. Fits Bormiolli […]

Stainless Canning Funnel


Fill those jars easily, and without the plastic! Stainless steel wide mouth funnel fits all wide mouth canning jars, and MOST narrow mouth jars for fast filling (may not fit older standard mouth jars that have thicker glass since that narrows the inside diameter by a fraction of an inch). Pack Kraut, drop in relishes, […]

The ORIGINAL one-way valve fermenting airlock! Imitation IS the sincerest form of flattery, and we have noticed that our product has been copied by other sellers of fermenting products. Remember, if you see someone else selling a one-way valve airlock for fermenting, THEY copied US, not the other way around! Fermenta Lock is still the only original invention, handmade in the US. If it isn't orange, it isn't the original!

We invented Fermenta Lock, Fermenta Free, and the valve used for Fermenta Fido and other Fermenta Airlock products. We invented Fermenta Dunk Extender. Patents are prohibitively expensive, and designed by the government not to protect the rights of individuals, but to provide another source of revenue and control for the government and lawyers. We are good at what we do. We have endless ideas and endless creativity, and competition does not scare us. Impatient thieves do not scare us - they are too busy taking shortcuts to make a success of it anyway, and they won't want to take the effort to actually MAKE a product and fill orders.

So if you want to copy our idea, go right ahead. If you want to market and sell a competing product, you are welcome to do so, as long as you do not patent our idea - we had it first, and our posts on FaceBook announcing the invention and launch of it will prove that. This idea is officially in the public domain, placed there by us. We will NOT release supply sources, or part names unless you want to buy them - we'll be happy to sell you an instruction kit. If you buy our product, or look at the images and figure it out for yourself, good on you. Compete with us if you like, just don't screw us, and we'll get along just fine. Big companies who might want to screw us may have more money, and more lawyers than we do, but we have more to gain by suing the pants off a big company, and believe me, we will be well motivated to do so if anyone patents our idea and claims it as their own - this is a free idea. Everybody now owns it.

Published June 23, 2012

Wholesale, Export, and Manufacture of this product by other companies is an option. International distributorships are available for those wishing to export. Please email us to inquire about access to our wholesale website, or in regards to manufacturing any of our products.

Business Building Services Are Available - If you are wanting to build a business like this, where you make things in the home and sell them direct to the customer, or if you want to build a business that you can sell to other people as a complete business package, Firelight Heritage Farm is now offering Cottage Industry Services to aid small business owners in building a successful product or service business from the home. Don't know what you want to do? We can help you figure that out too (something original, and just yours, not a canned business). You get the wisdom and uniquely successful perspective and experience of people who have been business, marketing, and website professionals for more than a dozen years. For more information, visit Why copy someone else's business when you can do something uniquely you and enjoy it so much more?

$7 Shipping

US Orders Only.

Email us for shipping quote on International Orders, and to place your order for shipping outside the US.

This website is only equipped to handle orders from US customers (International shipping must be calculated for each order). International Orders are now accepted BY EMAIL from UK, AU, CA, and shipped USPS (other countries will be considered if requested). Please email a list of the items you wish to order, using our Contact page, and we will give you a shipping quote, and then invoice you from PayPal for the total.
Uses of Fermenta Lock

Fermenta Lock is a compact airlock cap for mason jars, to help in making old fashioned brined pickles, and other lacto-fermented foods. Use Fermenta Lock for:

Pickles (all kinds)
Sauer Kraut
Milk Kefir
Bean Paste/Hummus
Sourdough Starter (if started with culture or yeast)
Anything which needs gas release without a lot of air circulation.

Customer Comments

"Living down in Guatemala, we have quite a lot of dampness in our houses and mold is an ongoing battle. After a long dose of antibiotics due to a parasite, I absolutely required probiotics to get my gut back in order and I know homemade sauerkraut has more probiotic content than anything else I could find here. I wasn't able to make my beloved sauerkraut or even Kombucha in my kitchen because mold would start growing immediately on the top. Your Fermenta Locks have literally been a lifesaver for me! No more mold, and PERFECT Kraut EVERY time!!! Thank you for creating such a wonderful product!!!"

A. Kratzert

"Oh how I wish I had found you first!! Too many experts and too many bucks later I discovered your "Lock" and the sheer elegance and simplicity of your system.Thank you for your help and affordability, it makes healthy food attainable."


"I came back to order more FermentaCaps. A wonderful innovation. I have not lost a single batch of sauerkraut since I started using the original Fermenta Locks."


(Last names omitted to protect customer privacy.)