What size nozzle do I need to refill the RPM 40 pod?
The nozzle on your e-liquid bottle must be no less than 9mm long and must be narrower in diameter than the filling slot of the pod, which measures 5mm. Using a correctly sized nozzle reduces the risk of dermal contact and accidental ingestion of e-liquid during refilling. (Page 7)
From the official Smok Rpm 40 manual, page 7
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