All-Metal Carbonation Cap: Heavy-duty carbonation cap, stainless steel material, no spots, and no stains, withstand hundreds and thousands using lasting forever. A highly machined carbonation cap won't be shaving metal filings from carbonation cap inner safer and healthier than any other normal carbonation cap. Stainless steel carbonation cap is suitable for carbonated water, watermelon , cocktails, lemonade, kombucha, maple cream , mead, and cider formulation Carbonation Cap & Top-one Counter-pressure Filler: The carbonation cap serves as a counter-pressure filler, line up great with the ball/gas lock disconnect for pressurizing beer from the keg to the plastic bottle. Standard 11/8 UN thread carbonation easily seals the 2L plastic bottle without needing much torque. The carbonation cap is very handy. Let's go to the party with a 2L plastic bottle instead of batches of glass beer bottles Beverage Carbonation & Beer Line Cleaner: Carbonation cap makes carbonation easy and funny, grateful for bring vitality to semi-flat beer, grocery wine and fruit juices. Meanwhile, carbonation cap is a great beer line cleaner, align up with beer gun and pump sprayer to clean beer lines just hook up to your ball lock fitting without destroy beer lines into pieces, take the best use of the keg,regulator and CO2 tank without waste 100% no leakage guaranteed: Food-grade silicone O-ring, rubber gasket for an air-tight, water-tight, leak-proof seal, no leakage even under vigorously shaking. High resilient rubber gasket won't be easily teared. Hold bottle's CO2 pressure all the day and night after multiple uses. A removable barb comes inside for connecting tube to make home brewing much easier and carbonating quicker. After-sell Services: Carbonation cap perfect for beverage Carbonation cap perfect for beverage carbonating and beer line cleaning, 100% no leakageguaranteed, only seal great with standard plastic bottles but also line up with gas/liquid ball lock