CARBONATION CAP FEATURES: Package: Stainless Steel Carbonation Cap with 2 PCS Rubber Ring; Connect: Unique Machined the Carbonation Cap, can fit Both Black Liquid Ball Lock Disconnect and Grey Gas Ball Lock Disconnect and the Barb Type usually Connect 1/4” or 3/16” Beer Line; Use: Carbonation Cap can Carbonate Various Beverages, including Soda, Beer, Juice, Water or Clean Beer Line; HOW TO USE: Leave around 2 or 3" of Space in the Bottle, Squeeze out all of the Air, then Tighten the Carbonation Cap on the Bottle; Connect the Gas Ball Lock Disconnect to the Carbonation Adapter and Start inject CO2 to the PET Bottles; Turn on the CO2 Regulator, Shake the Bottle Vigorously until reach a desired Carbonation Level; In order to CO2 can be absorbed much faster, Please Make Sure the Beer, Water, Juice, Soda is very Cold; The Carbonation Cap comply with international Quality Standards, it can attached to most Plastic Bottles; If you attend Parties, Picnics, Camping and so on, this Carbonation Cap is a best Choice to carbonate different Beverages; Quality Guarantee: Any Defective for Carbonation Cap, Money Back or Replacement free.