Plumbing materials: Are brass and copper pipes used in building plumbing for supply lines and for soil, waste, drain, and vent (DWV) applications, with selection depending on code and service conditions?

Introduction / Context:
Plumbing drawings and specifications must match materials to function. Copper has long been a staple for domestic water supply and also appears in certain DWV applications (with appropriate type and joining). Brass is commonly used for valves, fittings, traps, and sometimes pipe in corrosive or decorative contexts. This question confirms awareness of where brass and copper are used across supply and DWV systems, guided by code and service requirements.

Given Data / Assumptions:

• DWV means drain, waste, and vent lines.
• Local codes may favor other materials (e.g., PVC/ABS for DWV) but do not universally ban copper/brass.
• Pressure, temperature, water chemistry, and cost influence selection.

Concept / Approach:
Copper types (K, L, M, DWV) address different wall thicknesses and uses. Type DWV copper is specifically intended for drain and vent service (non-pressurized), whereas Types K and L are common for pressurized supply. Brass components are widespread as fittings and valves because of machinability and corrosion resistance. Thus, saying brass and copper are used for supply and DWV is generally correct, recognizing that alternatives may be preferred depending on jurisdiction and economics.

Step-by-Step Solution:

Verification / Alternative check:
Review code tables and manufacturer literature listing copper DWV tube and brass plumbing components; many jurisdictions accept them alongside plastics and cast iron, subject to conditions.

Why Other Options Are Wrong:
Claims restricting use to hot water only, non-pressurized only, or industrial plants only ignore the broad acceptance and history of copper/brass in buildings.

Common Pitfalls:
Ignoring water chemistry leading to pitting; mixing incompatible metals without dielectric unions; using the wrong copper type for pressure service.

Final Answer:
Correct