What must be provided between the building and the septic tank for maintenance?

The requirement for a two-way clean-out plug between the building and the septic tank is essential for maintenance purposes. This type of clean-out allows for access to the sewer line from both the building and the septic tank. It facilitates the clearing of any blockages that might occur in the line, ensuring effective maintenance and reducing the risk of backflow into the house.

Having access from both directions is particularly advantageous because it permits the use of a sewer snake or similar tools to remove clogs with minimal disruption. This is an important aspect of maintaining a healthy septic system, as it supports effective drainage and helps to prevent larger issues that could arise from untreated sewage buildup.

In contrast, single clean-outs do not provide the dual-directional access and may complicate maintenance efforts if a blockage occurs further down the line. A three-way clean-out is not a standard requirement for septic systems and may not provide the same level of accessibility. An outside clean-out chamber, while useful, does not specifically address the need for dual access for both routine and emergency maintenance scenarios that the two-way clean-out plug effectively supports. Therefore, the two-way clean-out plug is the optimal choice for ensuring proper maintenance access.