If you have a Flowmate Nano, you have to buy this adapter. It's really well made & screws on perfectly. The holes in the adapter seem to allow greater airflow than the screens in the provided mouthpiece. So it's easier to suck through than the mouthpiece. This means that you're getting greater airflow through the heating chamber (what that means I don't know), but it certainly seems more natural breathing through it. The adapter will get hot when using it, so be careful not to grab it. It fits perfectly into the 14mm bubbler I purchased at the same time. I will say that it feels a bit weird putting a metal thing into a glass thing, & a part of me is always wondering how great the seal is, but I ended up high as balls (actually wasn't my intention), so I figure it worked good enough. Easy to clean, well made, does the job, allows for a much more versatile vape; big thumbs up from me.