Gas Mods has released some great quality atomizers in the past year or so, and this one adopts a few features from their previous atomizers. Firstly, the HALA BF RDTA sports a base diameter of 22mm, so it'll pair great with your single battery mods. In addition, it does come with a BF 510 pin, allowing you to use it with your squonk mods! There's not too many RDTAs that's compatible with squonkers, so that's a huge bonus. Also, it does have an e-juice capacity of 2ml, which is expected with its super small size. Filling it can be done quickly, especially if you're using the included BF pin.