The Geek Vape Cerberus 25mm Sub-Ohm Tank is well-designed, featuring an innovative threaded top fill system, dual adjustable bottom airflow ring, and a new coil system featuring Super Mesh Coils. The Cerberus Sub-Ohm tank measures in at 25mm at the base, but increases to 27mm at the widest point using the included bubble glass expansion to upgrade the juice capacity from 4mL to 5.5mL. The Cerberus Sub-Ohm tank hosts an innovative top fill system, accessible by rotating the knurled and threaded top cap to reveal an oversized fill port. At the other end, the Cerberus has an adjustable dual-slotted bottom airflow ring to control the inlet of air to create conditions conducive to vapor or flavor production. The Cerberus Sub-Ohm tank is able to access the Super Mesh Coil Line, utilizing offerings like the X1 coil, best rated for 60-80W.