What device is specifically used to clear the airway of liquids?

The use of a Rescue Vac or Palu Pump is specifically designed for clearing the airway of liquids. This device is effective in removing fluids from the airway, making it an essential tool for lifeguards or first responders who need to ensure that a victim's airway is clear, especially in drowning situations or when fluid has entered the respiratory system.

While other devices listed, such as an oxygen mask or Ambu bag, serve critical functions in the realm of providing oxygen or assisting with ventilation, they do not have the specific mechanism required to actively clear fluid from the airway. A suction catheter is also used to clear airways, but the Rescue Vac or Palu Pump is particularly distinguished for its efficient design aimed specifically at emergency fluid removal, making it the most suitable choice for this purpose.