As seen in illustration D004SA below, what action must be taken before inserting a low-velocity fog applicator into an all-purpose nozzle?

Correct Answer: Option A — remove the high-velocity nozzle tip

Operating the USCG all-purpose nozzle requires removing the high-velocity tip before inserting the low-velocity fog applicator barrel, ensuring proper internal flow alignment and preventing destructive back-pressure within the nozzle assembly.