This is an all Stainless Steel Gas Diffusion Stone. Has a 1.5" T.C. connection, a 6" Stainless Stem, and a 0.5 Micron Diffusion stone.
Great for sanitary use during Macro-Oxygenation, or for scrubbing out CO2 using Argon. We recommend attaching a short length of tubing and a quick disconnect to this system to keep it sealed when not in use.
If you're looking at this item, you likely looked for it specifically. It's a tube through a tri-clamp connector with an O2 stone on the end of it. I've had mine a couple of years now and it works very well for what it is. The issue I had is that after about a year of use the O2 stone separated from the tube. Looking at it, it appeared that it was just held on with some kind of epoxy/glue (JB Weld maybe??). I cleaned up the pieces and used some superglue and that held for about another year. I superglued it again. For the price of it, I would have expected something that was more securely attached (soldered/welded).