The carbonation cap is a highly effective method to add and maintain carbonation in beverages for extended periods. The built-in 5/16 inch barb can attach to 5/16 inch ID tubing and a 0.5-micron carbonation stone, allowing portability between bottles. Made of stainless steel, it is durable and long-lasting. Compared to traditional bottling, kegging, and home seltzer machines, this cap saves time and money. Simple to use: fill a standard 2L bottle with homebrew or liquid, attach the cap and CO2 system, and shake. Carbonating home brew has never been easier. Use a standard plastic bottle with this carbonation cap for an easy and effective carbonation process. Product Type: Carbonation Equipment Type: Stainless Carbonation Cap Model: Counter Pressure Bottle Filling Cap Condition: Feature: Carbonation cap with ball lock Includes: Ball lock clamp Usage: Homebrew soda, beer, juice, water Quality: Top Fits: Most soft drink PET bottles Color: Black + Silver Material: Stainless steel + plastic Package Contents: 1 x Carbonation cap 1 x Ball lock distributor Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.