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. Get 4 times the power, 4 times the flexibility with this kit. In addition to being able to use your Nautilus X 2ML top airflow flavor tank with replaceable U-Tech coil system, add more flex with the: 1, Quad-Flex low-profile RDA with Turboline top airflow system option. 2, Quad-Flex low-profile bottom feed RDA with Turboline top airflow system option. 3, Quad-Flex drop-wick RDTA tank with dual or single airflow adjustability - Also allows for Turboline top cap fitting.