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These adapters are very simple and do just what they are supposed to do -- connect a 306 atomizer to your 510-threaded device while using a drip shield. You might find some other uses for this adapter, but that's how we use it. Normally you don't use an adapter to connect a 306 to a 510 device as the 306 is already 510-threaded. However, a Drip Jacket requires it, which is why it's here.
The adapter comes with a spacer ring that may not be needed depending on your set up. We have not found cause to use it.