ZOLL AEV Operator's Manual page 39

Exhalation Valve -- connects to the ventilator circuit using 1/4 inch ID exhalation valve
•
tubing. The barb-type connector is clear anodized aluminum to distinguish it from the other
connectors (the 1/4 inch ID ventilator circuit exhalation valve tubing is clear).
Ventilator Circuit Connections
906-0731-01-05 Rev. C ZOLL Ventilator Operator's Guide 2-13