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The 510-DCT is a combination of a dual coil SmokTech cartomizer with a tank that surrounds it keeping the cartomizer full. This has the advantages of both a dual coil cartomizer and the capacity of a large tank.
First you fill the cartomizer and then you fill the tank around it. The tank on the original version of the 510-DCT can hold up to 6ml or liquid (although you will only get about 5ml into the tank when filling). The cartomizer has a small hole punched in the bottom of it that allows the tank to continually refill the cartomizer so you always get a rich full vapor with full flavor.