Question

defective abs piping
occurred in installations after 1990
occurred throughout north america
resulted in cracking around the circumference of the pipe joints
is an issue with 1¼ - to 2 - inch diameter only
affected all manufacturers
question 14
all of the following are functions of plumbing vent systems except
vents allow air to be pushed out of the waste pipes ahead of slugs
vents allow water to flow quickly by avoiding low air pressure behind the slug of water
vents prevent siphoning of traps
vents provide a path for odors to escape from the house
vents provide a fresh air inlet directly to the living space

Explanation:

Plumbing vent systems allow air to move in waste - pipes, prevent siphoning of traps, and provide an escape path for odors. They do not provide fresh air directly to the living space. For defective ABS piping, it is known to have resulted in cracking around pipe joints.

Answer:

For the first question about defective ABS piping: C. resulted in cracking around the circumference of the pipe joints
For the second question about plumbing vent systems: E. vents provide a fresh air inlet directly to the living space