Which action should the nurse take when irrigating the patient's Salem sump tube?

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Use an Asepto syringe to place 10 mL air into blue pigtail.This assures patency of air vent.
Draw up 30 mL of normal saline into Asepto or catheter-tip syringe.After instilling saline,immediately aspirate,or pull back slowly on syringe to withdraw fluid.Use an Asepto syringe to place 10 mL air into blue pigtail.This assures patency of air vent.Never instill liquids by way of the blue pigtail.

Which Action Should the Nurse Take When Irrigating the Patient's