Vented Carbonation Caps for 2L Soda Bottles

Carbonate homemade soda safely and easily with our custom vented carbonation caps, designed to fit standard recycled 2-liter soda bottles. These specialty caps are the same ones included in our best-selling Root Beer Kit and Craft Cola Kit, and are now available for any DIY soda project! 

Each vented cap is engineered with a pressure-regulating lining that allows excess CO₂ to safely escape as your soda carbonates, preventing bottles from bursting.

With these specialty caps you can expect bottles to reach peak carbonation within 12–24 hours. Whether you're brewing your own soda or replacing a lost cap from your Craft a Brew kit, these vented bottle caps are the safe, reusable solution for at-home carbonation.

How to use: 

1. Clean and rinse recycled 2L soda bottles. Remove and discard the bottles' caps and tamper-resistant rings.
2. Transfer your homebrewed Root Beer, Cola or other soda syrup into the bottles and top with water, leaving 3 inches of head space.
3. Sprinkle 1/4 teaspoon of yeast, such as Red Star Premier Cuvee, into each bottle.
4. Gently squeeze the bottle to push out excess oxygen.
5. Gently push and twist on the Vented Carbonation Caps. Do not over-tighten, which can pinch the gasket and let carbonation escape.
6. Let bottles carbonate at room temperature for 12-24 hours (or once the soda bottles expand and harden like store bought sodas). Check the soda every ~6 hours to monitor progress. Once hardened, refrigerate immediately to slow the yeast.
7. Enjoy your carbonated soda within 1 week for best flavors. Beyond 1 week the yeast will continue converting sugars into CO₂, which will yield a drier (less sweet) and more bitter flavor and can make the bottles more dangerous to handle.