Question

which of the following devices protects against backflow?
double check valve assembly
atmospheric vacuum breaker
pressure - type vacuum breaker
temperature/pressure relief valve
pressure regulator
question 42
1 pts
which type of plastic piping is typically cream - colored and suitable for use on both the hot and cold water system?
pvc
cpvc
polybutylene
polyethylene
abs

Explanation:

1. A double - check valve assembly is designed to prevent backflow by having two independently acting check valves. An atmospheric vacuum breaker, pressure - type vacuum breaker, temperature/pressure relief valve, and pressure regulator are not primarily for backflow prevention.
2. CPVC (Chlorinated Polyvinyl Chloride) is typically cream - colored and can be used for both hot and cold water systems. PVC is mainly for cold water, polybutylene has different characteristics, polyethylene is used in various applications but not typically known for this specific use, and ABS is not suitable for hot water in the same way as CPVC.

Answer:

Question 1: double check valve assembly
Question 2: CPVC