Aspire Quad-Flex Squonker a.k.a. bottom feed RDA is the first of its kind. Just change out the RDA screw with the bottom-feed capillary screw and start squonking. Use the top-airflow sleeve when squonking. Aspire’s innovative new squonker screw there is sufficient capillary action to return the excess e-liquid to the bottom tank. The Quad-Flex Power Pack can be vaped as a low-profile RDA tank or a Squonker style RDA. It also allows you to turn your Nautilus X into the Quad-Flex Survival kit. Turn your Nautilus X into Quad-Flex RDTA: Use the Quad-Power RDTA Adapter to turn your Nautilus X tank into a Quad-Flex RDTA. The Quad-Flex RDTA configuration supports dual or single airflow. The Quad-Flex comes with two adjustable airflow sleeves. There is a top airflow and a side airflow sleeve. Interchange according to your airflow preferences.