The YFTK Replacement Airflow Insert is compatible with YFTK Flash e-Vapor V4.5S+ RTA Clone and it is also compatible with Original Flash e-Vapor V4.5 / V4.5S / V4.5S+ RTA, but it cannot be used in the YFTK Flash e-Vapor V4.5 RTA Clone. The airhole of this Airflow Insert is 0.9mm diameter.

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