Carbonation Cap – Red Plastic Ball Lock Cap for Soda Bottles

Turn any standard plastic soda bottle into a pressurizable mini keg or DIY carbonator with this red plastic Carbonation Cap. Featuring PCO 1881 threads and compatibility with both liquid and gas ball lock disconnects, it’s a versatile tool for homebrewers and soda makers alike. Whether you’re force carbonating beer, cider, or homemade soda, or just need a compact growler alternative, this cap makes it easy.

You can also use it for cleaning your draft system—just add cleaning solution to a soda bottle, attach it to your beer line, and let the pressure push the solution through the faucet.

Pair it with our Carbonation Cap Kit with Regulator and Hose for the ultimate home carbonation setup.

Additional Features:

• Works with gas and liquid ball lock fittings

• Fits standard 28 mm PCO 1881 soda bottle threads

• Perfect for carbonating, cleaning lines, or purging FermZilla collection containers

• Barb OD: 1/4″ | Barb ID: 3/16″ | Barb Length: 7/8″ | Overall Length: 2.5″

How to Carbonate Your Own Beverages at Home with a Carbonation Cap

Carbonation caps make it easy and affordable to carbonate beer, cider, soda, or even water in a standard plastic soda bottle. Here’s how it works:

1. Fill a Clean Soda Bottle: Pour your chilled beverage into a clean, dry plastic soda bottle, leaving a bit of headspace (don’t overfill). The beverage must be cold — the colder the liquid, the better it absorbs CO₂.
2. Attach the Carbonation Cap: Screw the carbonation cap onto the bottle. It’s designed to fit standard 28mm soda bottle threads.
3. Connect CO₂: Use a ball lock gas disconnect and regulator (like our Carbonation Kit with Regulator and Hose) to hook up a CO₂ tank to the carbonation cap. Start with a low pressure (10–30 PSI depending on how fizzy you want it).
4. Shake to Speed It Up (Optional): With the gas attached, gently shake the bottle for 30–60 seconds. This increases the contact between the CO₂ and liquid and helps it absorb faster.
5. Let It Sit: You can drink it right away if you shook it, or let it sit in the fridge under pressure for a day or two for a smoother result.

That’s it — fresh, fizzy drinks without needing a full kegging system. Great for small batches, bottling sparkling cider, or just keeping soda on hand.