Aspire has re-formatted one of their bestselling MTL tanks. The new K1 Tank is now leak proof and child proof. Innovative safe filling. Introducing the new Aspire K1 Pus Tank. The K1 Plus tank comes in two versions, a ‘standard’ 2.4 ml tank and a TPD version with a capacity of 1.9ml for TPD regions. The K1 tank also has replaceable 1.8ohm coils and is also compatible with Aspire original BVC coils and Aspire Spryte coils.