1)The distribution box shall be installed in a concealed way. When building the wall, the reserved hole shall be about 20mm larger than the length and width of the distribution box. The invention discloses a construction method of a reserved line hole of a distribution box slot, which comprises the following steps: s1, placing the prefabricated part at a preset position when building a wall; s2, building a brick body along the periphery of the prefabricated member to support. Kistner Concrete Products Inc. © 2026, Kistner Concrete Products Inc. Discover top-quality Outlet Economy Distribution by Kistner Concrete. The hydraulic involved in distribution box is presented in Doc n° MF4-S40 “Crest flow in distribution box” All the details can be found in the drawing Drawing n° MF4-D43: Example: Find details about the DB in the sketch map of the network: Number and diameters of outlets are written inside the DB. 1)The distribution box shall be installed in a concealed way. Distribution Boxes:Kon Kast produces precast concrete distribution boxes in 4 hole, 7 hole, 9 hole and 14 hole styles, as well as marketing plastic distribution boxes for septic fields in Kelowna BC, the Okanagan and British Columbia.