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24: Know and Understand
In agricultural plumbing systems, liquids and gases move under _____ or by _____ toward the lowest point in the system.
In a DWV system, what two functions does the venting system serve?
What would happen when a fixture drains water if air pressure were not maintained in a DWV system?
The _____ field of a septic system must be below the frost line in areas where temperatures are low enough to freeze the soil.
To minimize the scum layer, what items should not be put into a septic system?
Which of the following is not a characteristic of PEX pipe?
A. It is easy to install.
B. It must be shielded from sunlight.
C. It is reliable and long lasting.
D. Pipe cement is required for installation.
CPVC emits toxic _____ gas when exposed to flames.
ABS pipe is used only for _____ pipes in plumbing applications.
Which type of copper tubing—rigid or soft— is used for water supply lines?
When soldering copper pipes in an existing system, you must exclude _____ so the fixture heats enough to melt the solder.
What are the two basic forms of steel pipe?
What is the function of valves in a plumbing system?
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