The newest tank in the TFV series, the Smok TFV18, has a diameter of 31.6mm. Its straight bottom-to-top airflow system triples the admission velocity by passing through three large slots. The intake air can be freely adjusted by rotating the AFC ring, allowing for rich vapor and massive clouds. The TFV18 Tank has a secure locking mechanism on the top cap, which you can press to reveal the large filling port. This mechanism effectively prevents leaks and prevents accidental opening. The base of the tank has five braces that transfer power to the coil quickly and efficiently for circular heating.