2025/2026 – Plumbing Definitions, Installation
Codes, and Practice Questions.
Fixture connections that require the removal of an access panel for servicing are considered
Accessible
That part of the lowest piping of a drainage system that receives the discharge from soil, waste,
and other drainage pipes inside the walls fo the building and conveys it to a point 2 feet outside
the building wall is a
Building sewer
A vertical vent that is a continuation of the drain to which it connects is a
Circuit vent
A horizontal drain that is sized to provide free movement of air above the flow line of the drain
is called a
Continuous waste system
The length along the centerline of the pipe and fittings is the
Diameter length
A device integrated within an air accumulator vessel that is designed to discharge a
predetermined quantity of water to fixtures for flushing purposes is a
Expansion tank
The combination of fittings that may be used to make an offset and is considered a vertical pipe
are
1-45 degree and 1-45degree
Water safe for drinking and culinary purposes is referred to as
Potable water
By code definition, a stack is always
Vertical
, A vent that also serves as a drain is a
Wet vent
A pipe that makes an angle of not more than 45 degrees with the vertical is considered
Diagonal pipe
he vertical depth of a trap seal is measured from
The outlet of the trap to the bottom of the trap
A mixing valve that senses outlet temperature and compensates for fluctuations in incoming hot
or cold water temperature is a
Thermostatic (temperature control) valve
The lowest portion of the inside of a horizontal pipe is called the
Bottom
PEX is the acronym for
Cross-linked polyethylene
A confined space is a room or space having a volume equal to at least ______ of the aggregate
input rating of all the fuel-burning appliances in that space.
100 cubic feet per BTU/hr.
A joint obtained by the joining of metal parts with metallic mixtures or alloys that melt at a
temperature up to 840 degrees is a
Soldered joint
The organization, office, or individual responsible for enforcing the requirements of a
code or standard is the
Plumbing Inspector
That portion of a drainage system that does not drain by gravity into the building sewer is
known as a
Sewer ejector
A pipe inside a building that conveys storm water from the roof to a storm drain is called a (an)
Building storm drain