Question

question 1
cvpc water pipe may not be used for hot and cold supply lines
in single - family residences
in multi - family residences
inside a building
below grade
with oil - fired water heaters

Explanation:

CPVC (Chlorinated Polyvinyl Chloride) pipes are not suitable for below - grade installations for hot and cold supply lines due to potential soil and moisture issues that can damage the pipes over time.

Answer:

D. below grade