Texas Tradesman Plumber-Limited License Practice Exam 2025 – The Comprehensive All-in-One Guide for Guaranteed Success!

When connecting horizontal drainage lines with other horizontal drainage lines, the most appropriate fitting is a 45° wye branch. This fitting is designed to allow for smooth transitions and maintain proper flow within the piping network.

Using a 45° angle helps to reduce the likelihood of flow obstructive factors that could arise with sharper angles, such as a 90° elbow. The wye shape facilitates more gradual changes in direction, which is essential for effective drainage and minimizing potential blockages. Additionally, this type of fitting helps to promote better hydraulic performance, reducing the risk of turbulence that can occur with sharper turns.

Other options, such as 90° elbows, which create sharp turns in the line, can lead to increased friction and may impede flow. Tees can also change direction but are typically more suited for situations where a branch line is needed rather than just connecting horizontal lines. Reducers are used for changing pipe sizes and do not serve the purpose of changing direction effectively. Therefore, the 45° wye branch is recognized as the correct choice for connecting horizontal drainage lines efficiently.