Evenly distributes septic tank effluent into a leaching system, typically a septic field. Seven plastic pipe seals that fit 4 in. Product availability varies by location. The Polylok 24" Rhino Baffled Distribution Box is the most versatile box on the market. The baffled design allows for solids to settle on the bottom of the box instead of going to the leach field, extending the life of the field. In some cases, depending upon the type of inlet device used, it. Jefferson Concrete Corp. All the pipe penetrations have a gasket and “speed levelers” are available to ensure that all distribution lines receive equal flow. Distribution Boxes: PREMIUM CONSTRUCTION POWER DISTRIBUTION BOX: Crafted by WESTERN, the 6506TLSX Temp power box features a durable blend material for long-lasting performance in demanding environments.