This is a housing that you can buy to attach the Molecule M15 to the Poseidon bubbler. The coil holds the quartz bowl in place. This is made from the same high quality 304 SS used in the molecule and will last a very long time with proper care. The O-Rings included are glow in the dark green, non-toxic and odorless silicone, and black so you have options. AVS used silicone because the temperatures won't get high enough to be a concern where it's placed so far from the heating element. The silicone also allows for easier removal of your glass accessory.