What type of fittings are required for galvanized drainage, waste, and vent pipes?

The correct answer pertains to the specific requirements for galvanized drainage, waste, and vent (DWV) pipes. Galvanized pipes are designed to resist rust and corrosion, and using the appropriate fittings is essential for maintaining the integrity and performance of the plumbing system.

Recessed type fittings are specifically used for connecting galvanized pipes because they accommodate the thicker walls of these pipes, ensuring a secure and leak-proof joint. These fittings allow for a cleaner and more streamlined installation, which is important in drainage applications where flow efficiency and space considerations are key.

In contrast, slip type, standard type, and compression type fittings may not provide the necessary structural compatibility and seal needed for galvanized systems. Their design features may be better suited for other types of pipes or applications where the material properties differ significantly from galvanized steel.