
Safety Pop O Valve
Manual Ventilation
Screw-down pop-o valve open with push-button
valve depressed.
In this position the breathing circuit is closed but
will leak at pressures of 20-25 cm H2O. This al-
lows enough pressure to manually ventilate the
patient without risking excessive pressure (which
can cause pulmonary damage and death).
User Error! (pop o valve left closed)
Screw-down pop-o valve closed with push-
button valve open
In this position the breathing circuit is partially
closed but will leak at 0.5 cm H2O. This will not
cause injury to the patient, however depress-
ing the push-button valve to ventilate the patient
would allow excessive pressure and could injure
the patient.
This setting is designed to prevent patient deaths
associated with leaving the pop-o valve closed
but it is not recommended for normal operation.
Normal Operation
Screw-down pop-o valve open with push-button
valve up
In this position the breathing circuit is fully open.
The manometer should read "0" with slight
uctuations during respiration. Squeezing the
rebreathing bag should not create pressure in the
breathing circuit.