The Nova RDA from Gas Mods is a low-profile rebuildable dripper in the style of the popular Derringer by Praxis Vapors and Wotofo's Tobhino. It has a 22mm diameter and will fit any mod, but is best used with squonk mods and the included BF (bottom feeding) pin.
The Nova RDA has a dual terminal post-less style design and will accommodate single coil builds. Part of the reason for the low profile design of the rebuildable is the flatter build deck, which reduces height for the overall RDA.
Despite the small form factor, the Nova RDA fits in sufficient side airflow to allow for either mouth-to-lung or direct lung inhales.
Reviews have been universally positive for the Nova RDA, so if you're keen on a smaller RDA with a low profile - but which is still capable of squonking so you don't need to fill as often - then you really can't go wrong here.
Gas Mods Nova RDA
BF Squonk Pin