What type of fitting is referred to as "test tee(s)"?

Test tees are fittings specifically designed to facilitate the testing of drainage systems. They typically incorporate a cleanout feature, allowing for easy access to the interior of the pipe for maintenance and inspection purposes. The design of these fittings often includes a horizontal branch, which makes it convenient to connect testing equipment, such as pressure gauges or other devices necessary for evaluating the performance of the drainage system.

In this context, the reference to "I and V," "II and V," "I and II," and "III and IV" relates to different types of fittings categorized in the plumbing trade. The correct pairs are determined based on their functionality and design characteristics associated with testing.

The right answer connects the specified fittings that serve the designated purpose of testing drainage systems, highlighting their importance in ensuring the plumbing system operates effectively and meets the required codes and standards for performance and safety. This understanding is crucial for professionals in the plumbing field as it emphasizes the practical application of these fittings in real-world scenarios.