This video will help you look into Aspire Quad-Flex deeply, and know how to configure RDTA, RDA, Squonker RDA and Nautilus X with this kit.
RDTA can be filled by 2 different methods, you can also use the drip tip adapter to use your own 510 drip tip.
RDA can be built with the provided pre-built coils and cotton, you can choose the side airflow hardware or the top airflow hardware for different vaping experience.
Change the screw to Capillary screw, you will be able to use the RDA on a Squonker mod. Note: Aspire will not make Squonker mod in the near future.
The Nautilus X is with all new 1.8 ohm coil which will provide richer and tighter flavor.