Get replacement cartomizers here. Introducing the new SMOKtech Ultimate Dual Coil Tank also known as UDCT. One of the big improvements over their DCT is a locking cap/ring at the base that will secure your dual coil tank cartomizer and keep it from possibly slipping out and causing a leaky mess. The cartomizer is flanged of course and it is cut on either side so that it almost 'clicks' into place into the groove at the base of the UDCT. To fill remove the bottom ring and pull out the carto then fill from the top. The top and bottom caps are fixed on this unit and made of metal. The clear portion is made from PC, poly carbonate. You will receive a complete Tank unit: UDCT tank with locking ring and groove at the base to prevent your carto from spinning about. SMOKtech DCT-2 dual punched 1.5om dual coil cartomizer; 45mm from base to top. Clear 510 drip tip (you can use your own drip tip) Locking bottom cap/ring to secure cartomizer from sliding out accidentally. Extra DCT-2 dual coil cartos are available in this same category. Get replacement cartomizers here.