Rhode Island Journeyman Plumber Practice Exam 2025 - Free Journeyman Plumber Practice Questions and Study Guide

Testing with air is an essential procedure in plumbing to ensure the integrity of systems and prevent any leaks that could lead to contamination. All the devices listed are designed to work under specific conditions and can indeed be tested with air.

The atmospheric type vacuum breaker is designed to prevent backflow by allowing air to enter the system when there is a drop in pressure. Testing it with air ensures that it functions properly and can effectively break any potential vacuum conditions.

The pressure type vacuum breaker also serves a similar purpose but is able to maintain integrity in systems under pressure. Testing it with air verifies its ability to open and allow air ingress to prevent backflow under varying pressure conditions.

The reduced pressure principle backflow preventer is a more complex device that provides protection from backflow in situations where water could become contaminated. It employs air testing to confirm that all internal components are functioning correctly and can withstand operational pressures without failing.

Given that all these devices can be subjected to air testing to validate their performance, the comprehensive nature of the answer encompasses each device's operation and testing requirements.