*Creates an airtight seal for wide mouth mason jars with plastic lids

*Do you love using mason jars for everything? This is the best way to use mason jars effectively by getting an airtight seal. You will regret not having these sooner.

*Keeps leftovers longer due to airtight seal.

*Makes for leak-proof travel (smoothies, iced coffee, sauces, etc)

*Is a GREAT and cost effective way to do secondary fermentations for kefir, kombucha, and fermented sodas. (easier to clean then flip top bottles). Works great for fermenting vegetables, too!