The 40mm Mason Dumptank RTA from Vapergate. Built with both flavor and production in mind, the Dumptank offers a continually variable air flow control for completely closed off to a wide open draw. The Channeled juice holes allow the builder to position the wick without fear of the bell cap dislodging them. A generous 30mm deck offers plenty of space for anything from simple to advanced builds. Recommended build specs are 4mm-4.5mm or 5/32-11/64 coil diameter with medium snug wicking tension for best reesults.