LOL!
I got one too but it was gold and shaped like a goldfish bowl! I was clueless until a friend showed me that section of their site, which seems to be missing at the moment! These are intended to be *stackable*, build your own drip tip. They are usually like $2 each and come in a variety of sizes, shapes and colors. You can mix and match and combine them any way you like, like legos.
I use them as an extra heat shield on my hotter drippers to protect an acrylic or delrin drip tip
