Wasp Nano MTL Review. Oumier Wasp Nano MTL RTA is created to cater for those vapers who prefer higher resistance coils, more airflow restriction, and higher nicotine / nicotine salt e-liquid. Measuring 22mm in base diameter, this RTA can hold up to 1.2ml of e-juice with a straight glass tube and 2ml with a bubble glass tube. On the base of the RTA is the adjustable airflow ring to give you plenty of airflow options to suit your preference.
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