Do you know the extraordinary feature of Oumier Gragas RDTA Rebuildable Dripping Tank?

Oumier Gragas RDTA Rebuildable Dripping Tank:$20.99
What is the extraordinary feature?
1. it have a easy handing RDA build deck with top filling anti-leak. 17 diameter inner cap space and 2.1mm*3.0mm post hole fit for common wire. Easy unplug base like most usual RDA.
2. It is Free Refueling just need press the top cap to solve the disadvantage of all RDA refueling inconvenient.
We can see it's special features clearly:



Features:
Top filling anti-leak
Top airflow control
Glass tank
4ml juice capacity
Stainless steel + brass posts design
Free refueling
510 threading connection
25mm overall diameter
Comes with 2 spare glass tanks and drip tip

Another newest item from Oumier:
Oumier White Bone Mini RTA Tank:$18.99