ITEM NAME:2 Micron Diffusion Stone Stainless Aeration Stone Carbonating Stone for Beer Description: Diffusion Stone Stainless Steel Aeration Stone Carbonating Stone for Beer For adding O2 to your brew or seltzer water 2 Micron Diffusion Air Stone Made of stainless steel material Attaches to plastic bottles and connects to a gas side ball-lock disconnect in order to inject CO2 into the bottle, creating carbonationï ¼Å’your beer is available to drink almost immediately. It can be attached to plastic bottles, gas (grey) ball lock connectors, or liquid (black) ball lock connectors Specification: Size:47x13mm Package Includes: 1xBeer Diffusion Stone.Made of stainless steel material. For adding O2 to your brew or seltzer water.