Open Installation: Here, the distribution box is fixed on the surface of walls or panels. This setup makes it easy to access and maintain, but the cables remain visible. Good labeling of breakers is very important. Am I doing something wrong or is it a bug or glitch or something? Here's a screenshot: https://prnt. sc/_DForisFTnJI It tells me to keep pressing "F" which I did but it just doesn't. A septic distribution box (D-box) is a concrete or plastic junction that evenly distributes wastewater from your septic tank to all drainfield lateral lines. When it fails, symptoms include uneven wet spots in the yard, slow indoor drains, and sewage odors.