Stainless Steel Aeration / Oxygenation AssemblyConnects inline with any , Pump, or counterflow/plate wort chiller1/4 inch barb inlet for oxygen regulator or air pump connection1/2 inch Hose barbs for beer flowJust connect your oxygen regulator or aeration pump to the Stainless Steel diffusion stone and aerate your wort as beer flows through . All parts are Stainless Steel.Colour: silverMaterial: stainless steelPackage Contents:1 x 2 Micrometre Diffusion Stone1 x 1/2 inch Tee2 x 1/2 inch Hose BarbOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.