Two ⅛th bends can be assembled together to form which plumbing fitting?

Assembling two ⅛th bends together results in a fitting that effectively changes the direction of a pipe run by a total of 180 degrees. This configuration mimics the functionality of a 90-degree elbow fitting, which is designed to redirect the flow of water or other liquids at a right angle.

In plumbing systems, elbows are essential for navigating around obstacles or configuring pipelines in tight spaces. When two ⅛th bends are connected, they create a continuous curve that allows for this kind of redirection, just like a traditional elbow fitting.

The other options relate to different types of connections and functionalities that do not align with the bending capability of combining two ⅛th bends. A Wye fitting, for example, is used to create a branch in a plumbing line at a 45-degree angle, while a straight connector is for joining two pipes end-to-end without redirection. A union provides a detachable connection between two pipes, but it does not change the direction. Therefore, the function of two ⅛th bends corresponds directly to that of a 90-degree elbow, making it the correct answer.