If you want to add a battery with eGo...
If you want to add a battery with eGo threading to a larger 510 threaded atomizer device this ring will make an attractive join between the two.
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If you want to add a standard size eGo-threaded battery (ususally 14mm diameter) to a larger 510-threaded atomizer/tank (19mm diameter is ideal) this adapter ring will make an attractive join between the two and provide extra support.
The picture is slightly out of date because it doesn't show the 4 x 2mm vent slots to the widest end. They're not particularly noticeable but they're an important safety feature.
The diameters of the two sides of this adapter ring are in the region of 19mm and 12mm.
The before and after pictures above show you how it's used.
You can connect them without the use of this ring but it's not a good look, as you will see from the last picture.
The smaller side of the adapter ring is first screwed on to the top of the battery and then the atomizer/tank is screwed on to the wider end of the adapter.
The item is per one adapter and the picture shows it from different angles.