Aspire K3 Tank This is an ideal tank for new and more seasoned vapers. The K3 tank from Aspire uses the same coils as the Aspire Nautilus tank, which have been so successful, and that also means there's a very good chance of getting the replacement coils for quite some time to come, which isn't the case with all new products if they don't prove themselves to be popular. The stylish K3 complies with the TPD reg requirements so it has a 2ml liquid capacity. Main features Stainless steel construction Pyrex glass tank (impervious to abrasive e-liquids) Juice capacity 2ml Uses organic cotton Nautilus BVC coils Height 48mm (excluding the thread) Diameter 18mm Complies with European CE and RoHS standards Compatibility Standard 510 tank connection (18mm) Standard 510 drip tip connection.