What is the proper sewage drain pipes for bathroom?

The proper sewage drain pipes for bathrooms typically include PVC (polyvinyl chloride) or ABS (acrylonitrile butadiene styrene) pipes. These materials are durable, resistant to corrosion, and suitable for carrying wastewater. Standard sizes for drain pipes are usually 1.5 inches for sinks and 3 to 4 inches for toilets, ensuring adequate flow and preventing clogs. It's essential to follow local Plumbing codes and regulations when selecting and installing these pipes.