Which item is essential in a lineman's first-aid kit?

A CPR mask is essential in a lineman's first-aid kit because it provides a critical means of delivering rescue breaths during cardiopulmonary resuscitation (CPR) while maintaining a barrier between the rescuer and the victim. This is particularly important in emergency situations where breathing has stopped or is inadequate. The mask protects against the transmission of infectious diseases and allows for effective ventilation while keeping the rescuer safe.

In the context of first-aid scenarios that linemen may encounter, having the right tools for immediate response to life-threatening situations is paramount. While other items like a flare gun, fire extinguisher, and flashlight may be useful in various emergency situations, they do not address the immediate need for providing respiratory support, which can be lifesaving in cases of cardiac arrest or severe respiratory distress. Therefore, the presence of a CPR mask underscores its importance in enhancing the safety and preparedness of linemen in the field.