Identify the piece of equipment generally used for CPR with a one-way valve to prevent backflow.

The piece of equipment typically used for CPR that includes a one-way valve to prevent backflow is the pocket mask. This device is designed for delivering rescue breaths during cardiopulmonary resuscitation (CPR) to a victim. The one-way valve allows the rescuer to provide air to the patient while ensuring that any expired air or potential contaminants do not return to the rescuer. This helps to maintain hygiene and reduce the risk of infection for both the rescuer and the patient.

In contrast, the other options serve different purposes or lack the specific features of the pocket mask. The simple mask does not have the one-way valve and is not intended for the same type of emergency situations as the pocket mask. The bag valve mask is essentially a more complex piece of equipment used for ventilating patients and requires more training to use effectively. The non-rebreather mask is designed primarily for providing high concentrations of oxygen and is not utilized for CPR.