Through which pipe do wastes from plumbing fixtures typically discharge?

The appropriate pipe for discharging wastes from plumbing fixtures is the drain pipe. Drain pipes are designed to carry wastewater away from fixtures such as sinks, toilets, and showers to the sewage system or septic tank. They are a critical component of plumbing systems, ensuring that waste is efficiently removed from a building while also preventing odors from escaping back into the living space.

The other terms mentioned refer to specific parts or types of plumbing configurations rather than the pipe itself responsible for waste discharge. A trap pipe is not a commonly recognized term in standard plumbing terminology. Both P-traps and S-traps serve important functions in preventing sewer gases from entering buildings and helping maintain a water seal that blocks odors. However, they are not the actual pipes that transport waste away; instead, they act as integral components of the drainage system, connecting fixtures to the drain pipes.

Thus, while P-traps and S-traps are crucial for proper drainage and odor control, they are not the main pipes through which wastes are discharged. Instead, the drain pipe fulfills this primary role in the plumbing system.