Replacement Glass tube for Z Dual RTA(Discontinued) / ZX RTA / ZX II RTA / Z Sub-Ohm Tank (2021) / Z Sub-ohm SE tank / . A great choice for those who prefer larger capacity tanks. Use to the corresponding atomizer capacity has changed, please see the table for the corresponding capacity Applicable Models Z Dual bubble Glass tube 5ML Z glass tube 4ML ZEUS Dual RTA(Discontinued) 5.5ml 4ml ZX RTA 4.5ml 3.5ml ZX II RTA 4.5ml 3.5ml Z Subohm Tank 5ml 3.5ml Z Subohm SE Tank 5.5ml 4ml Z Subohm Tank 2021 5ml 3.5ml Z Fli Tank 5ml 3.5ml Package included 1* Replacement Glass Tube