Concrete septic tank distribution boxes are more expensive than plastic and fiberglass, but you'll also pay more for larger d-boxes, as well as d-boxes with more outlets. The more outlets a distribution box has, the more pipes it can distribute waste. Concrete septic tank distribution boxes are more expensive than plastic and fiberglass, but you'll also pay more for larger d-boxes, as well as d-boxes with more outlets. The more outlets a distribution box has, the more pipes it can distribute wastewater into, allowing for a more evenly distributed leach field.Where you live can also influence the cost to replace a septic distribution box. Because labor is such a large portion of the total price, local labor rates can have a large impact on what you pay. If you live in an area with a high cost of living, expect to pay up to $200 an hour(sometimes even more) for labor.If you have a septic warranty(often a limited warranty from the manufacturer), you may not have to pay to replace the d-box. However, it's unlikely that your septic system distribution box will fail during the limited warranty; d-boxes can last 30-plus years. If you don't have a septic warranty or if it's expired, check your home warranty to see if. You can trace several common septic tank problemsto the distribution box itself. Whether it's strong odors, standing water around the septic tank or a sewage backup in the leach field, your d-box might be the problem. If the distribution box is the issue, you'll not only have to pay to replace it (or repair it, depending on the problem), but you'll.