A listed device allowed to meet water delivery requirements to the inspector's test connection on a dry system is?

A quick opening device is a component specifically designed to allow water to flow rapidly when a fire protection system is activated, ensuring that the system delivers water to the designated areas efficiently and effectively. When it comes to inspector's test connections on dry systems, the quick opening device is crucial because it helps meet the necessary water delivery requirements swiftly, demonstrating that the suppression system can perform reliably in an actual emergency.

In dry sprinkler systems, it’s essential to have a means of testing the system to ensure that adequate water will reach the necessary areas in a timely manner. The quick opening device facilitates this test by minimizing lag time between system activation and water delivery, which is critical for maintaining safety standards and ensuring compliance with fire protection regulations.

Other options, although relevant in different contexts of fire protection systems, do not specifically serve the function of ensuring rapid water delivery in the way a quick opening device does. A main drain is primarily used for draining the system, the inspector's test valve is a specific means to test the system but is not classified as a device that facilitates rapid delivery, and an express drain is not standard terminology in this context. Therefore, the quick opening device stands out as the correct answer for meeting the inspector's test connection requirements on a dry system.