Diffusion Stones, or 'Air Stones', are commonly used to aerate wort before fermentation, which helps ensure a healthy start to the fermentation process. Diffusion Stones can be attached to compressed oxygen tanks or air pumps (such as those used with aquariums). This "Stone" is made of stainless steel, so it's durable, easy to clean, and won't crumble in your wort after a few uses like other materials!

The gas input port is a male 1/4" flare fitting. Connecting a hose requires a FFL swivel barb. This assembly can also thread into the 1.5" TC cap that has 1/4" FFL on the inside of the flange. Finally, since it also has the "tailpiece" profile, you can use a CoolTouch nut to secure this into a 1/2" Male NPT fitting.