Yes, users can just buy the K4 mod separately from Aspire online store, here is the link of your reference: https://online.aspirecig.com/aspire-k4-battery-p-267.html
Articles Tagged: k4 kit
The glass tube of my K4 tank is broken, what can I do?
The tank included in the K4 kit is the Cleito tank, Users can just buy the replacement glass tube for the Cleito tank from online store, here is the link for or reference: https://online.aspirecig.com/aspire-cleito-replacement-pyrex-glass-tube-p-176.html
Can I use Cleito 0.4ohm coil or 0.2ohm coil on the K4 mod?
No, as the output wattage of K4 mod may not suitable for these coils
What kind of wall adaptor can I use to charge my K4?
We suggest that the wall adaptor has a specification of 5V/1A