Check out the VOOPOO PnP Pod Tank, featuring a 4.5mL bottom filled capacity, PnP Coil Compatibility, and is fastened by a 510 connection. 

Features:

• 26mm Diameter
• 4.5mL Refillable Pod Capacity
• Bottom Fill System
• VOOPOO PnP Coil Series
• 0.3ohm PnP-VM1 Coil - rated for 32-40W
• 0.2ohm PnP-VM5 Coil - rated for 40-60W
• Bottom Press Fit Coil Installation
• Dual Slotted Bottom Airflow Control Ring
• Threaded 510 Connection