Rhode Island Journeyman Plumber Practice Exam

What is used to connect plumbing fixtures to the drainage system?

1. Supply pipes

2. Drainage pipes

3. Vent pipes

4. Fittings

The correct answer is: Drainage pipes

The connection of plumbing fixtures to the drainage system primarily involves the use of drainage pipes. These pipes are specifically designed to carry wastewater away from plumbing fixtures, such as sinks, toilets, and showers, to the sewage system or septic tank. Drainage pipes are typically larger in diameter than supply pipes, allowing for the efficient removal of waste and preventing blockages. In the plumbing system, drainage pipes serve a crucial function, as they ensure that water and waste are effectively transported away, minimizing the risk of leaks and odors in the living space. The materials used for drainage pipes can vary, commonly including PVC, ABS, or cast iron, each chosen based on the specific requirements of the plumbing installation. Supply pipes, while essential for delivering water to fixtures, do not connect directly to the drainage system. Vent pipes, on the other hand, are designed to equalize air pressure in the drainage system but do not carry wastewater. Fittings are components used to connect sections of pipes, but they do not themselves serve as the main conduits for waste removal. Therefore, drainage pipes are the key element that connects plumbing fixtures to the drainage system.