WOTOFO MTL RTA Tank 3mlWOTOFO COG MTL RTA Tank 3ml The COG MTL RTA is a mouth to lung RTA designed especially for builders who prefer nic salts or high nicotine vaping. Its the new collaboration between Wotofo and Suck My Mod, featuring single coil setup on a 22mm build deck and 3ml tank reservoir. COG MTL RTA Features 1. 22mm MTL RTA, compact and exquisite. 2. Pal of nic salts or high nicotine vaping. 3. Vapor condensing drip tip that presses comfortably against lips. 4.