What device provides a sanitary seal between well casing and the effluent line?

The pitless adapter is a crucial device used in well systems to ensure a sanitary seal between the well casing and the effluent line. This adapter is designed to connect the well to the discharge piping while maintaining a sanitary barrier, preventing contaminants from entering the well water supply. The design of the pitless adapter allows for effective and safe transmission of water from the well to the surface, avoiding any potential backflow of polluted water.

In the context of well construction, a pitless adapter is particularly beneficial because it enables the well to remain accessible and free from contamination that could occur if the discharge pipe were simply installed through an above-ground fitting. This device is an integral component in protecting the water source, ensuring safe and clean water for the end user.

In contrast, the other options do not serve this specific function. A check valve is used to prevent backflow in a pipe system but does not provide a sanitary seal between a well casing and an effluent line. An air gap, while an important method for preventing contamination in plumbing systems, is not applicable in the context of well installations. Lastly, a septic tank is part of a wastewater management system and does not relate to the sanitary sealing of a well's discharge system. Thus, the pitless adapter