What is the name of the fitting that allows for central placement of horizontal and vertical runs?

The double sanitary tee is a fitting specifically designed to facilitate the central placement of both horizontal and vertical pipes, allowing for smooth transitions between these two orientations. This fitting is particularly valuable in drainage and venting systems, where it is important to maintain proper flow and minimize the risk of clogs or backflow.

In practice, a double sanitary tee has two openings that allow for the connection of pipes at right angles to one another, effectively creating an intersection point while ensuring that gravity can assist in the drainage process. Its design helps to maintain the flow direction and prevents turbulence, which can be problematic in plumbing systems.

The other fittings serve different purposes. A single sanitary tee allows for one vertical and one horizontal connection but does not provide the same dual connection capability as the double sanitary tee. A cross fitting allows for four connections and is more suited for applications requiring multiple branch connections rather than focusing on a centralized vertical and horizontal alignment. A reducer fitting is used to connect pipes of different diameters and does not inherently facilitate vertical and horizontal intersections.