Master Plumber 2026-2027 Plumbing Code Refresher Exam | Updated Practice Questions & Code Review
Highest flood level rim of fixture Unless prohibited by structural conditions, what is the reference of each vertical
vent pipes before offsetting horizontal to join the stack vent or vent stack?
a. Air gap fixture
b. Highest flood level rim of fixture
c. Water level inside the trap
d. Invert of trap
not less than 152 mm Unless prohibited by structural conditions, each vent shall rise vertically to a point
___________ above the highest flood level rim of the fixtures served
Hydrogen Evolves as a moist gas from organic waste
Methane A combination of hydrogen and carbon; a principal component of natural gas
Carbon Dioxide a combination of carbon and oxygen; the simplest oxide of carbon
4 dishwasher receptor A 65 mm branch can carry the load of _____.
a. 4 dishwasher receptor
b. 8 floor drains
c. 3 flushing rim sink
d. 4 private water closet
irrigation water piping The size and materials used for ______ installed outside any building or structure
and separated from the potable water supply system by means of an approved
airgap or backflow prevention device is not regulated by the Revised National
Plumbing Code of the Philippines.
101.6 mm Extension of partitions or baffles between compartments above the liquid level of a
septic tank
104.6 mm refers to dia. of vertical leg of a round inlet and outlet fittings, and dia. of the
inverted fitting
106.6 mm refers to horizontal dimension of baffle type fitting when measured at inlet and outlet
pipe inverts
50.8 mm refers to height of the cover of septic tank above the back vent openings
4 inches For metallic pipe fittings in fuel applications, threaded fittings in sizes larger than
_____ shall not be used unless approved by the Authority having jurisdiction.
Combination wye and 1/8 bend Which is not a connection for vertical lines to horizontal drainage lines?
a. 45 degree branches
b. longer sweeps
c. 60 degree branches
d. Combination wye and 1/8 bend
, Master Plumber 2026-2027 Plumbing Code Refresher Exam | Updated Practice Questions & Code Review
15 feet (or 4.6 meters) When disposal fields and/or seepage pits are installed in sloping ground, the
minimum horizontal distance between any part of the leaching system and ground
surface shall be _____.
Principle #22 Sewage or other waste from a plumbing system which may be deleterious to
surface or sub-surface waters shall not be discharged into the ground or into any
waterway, unless first rendered innocuous through subjetion to some acceptable
form of treatement.
Principle #7 This principle talks about non-absorbent plumbing fixtures
Principle #11 This principle talks about adequate circulation of air
Principle #21 This principle talks about the preservation of structural members
Black steel or black iron The common pipe material used for gas piping in residential installations; This is
also preferred for gas lines due to its strength, durability, and heat resistance
Catch basin What installation in the plumbing system is connected to separate installation of
drainage and terminated at the storm sewer? This also collects water from the
downspout and other excess water, and filters debris.
10 ft head of water for at least 15 minutes The water test shall be done with not less than _____.
minimum 34.5 kpa for at least 15 minutes The air test shall be done with __________.
14 threads per inch How many threads per inch does a pipe size of 3/4" have?
18 TPI How many threads per inch for pipe sizes of 1/4" and 3/8"?
11-1/2 TPI How many threads per inch for pipe sizes of 1" to 2"?
8 TPI How many threads per inch for pipe sizes of 2-1/2" and up?
30cm wider than pipe diameter (or, equal to the pipe outer The trench width at pipe grade should be _____.
diameter plus 12 inches.)
Leader An exterior vertical drainage pipe for conveying storm water from roof or gutter
drains; a pipe connected from building gutter to the downspout or conductor.
Highest flood level rim of fixture Unless prohibited by structural conditions, what is the reference of each vertical
vent pipes before offsetting horizontal to join the stack vent or vent stack?
a. Air gap fixture
b. Highest flood level rim of fixture
c. Water level inside the trap
d. Invert of trap
not less than 152 mm Unless prohibited by structural conditions, each vent shall rise vertically to a point
___________ above the highest flood level rim of the fixtures served
Hydrogen Evolves as a moist gas from organic waste
Methane A combination of hydrogen and carbon; a principal component of natural gas
Carbon Dioxide a combination of carbon and oxygen; the simplest oxide of carbon
4 dishwasher receptor A 65 mm branch can carry the load of _____.
a. 4 dishwasher receptor
b. 8 floor drains
c. 3 flushing rim sink
d. 4 private water closet
irrigation water piping The size and materials used for ______ installed outside any building or structure
and separated from the potable water supply system by means of an approved
airgap or backflow prevention device is not regulated by the Revised National
Plumbing Code of the Philippines.
101.6 mm Extension of partitions or baffles between compartments above the liquid level of a
septic tank
104.6 mm refers to dia. of vertical leg of a round inlet and outlet fittings, and dia. of the
inverted fitting
106.6 mm refers to horizontal dimension of baffle type fitting when measured at inlet and outlet
pipe inverts
50.8 mm refers to height of the cover of septic tank above the back vent openings
4 inches For metallic pipe fittings in fuel applications, threaded fittings in sizes larger than
_____ shall not be used unless approved by the Authority having jurisdiction.
Combination wye and 1/8 bend Which is not a connection for vertical lines to horizontal drainage lines?
a. 45 degree branches
b. longer sweeps
c. 60 degree branches
d. Combination wye and 1/8 bend
, Master Plumber 2026-2027 Plumbing Code Refresher Exam | Updated Practice Questions & Code Review
15 feet (or 4.6 meters) When disposal fields and/or seepage pits are installed in sloping ground, the
minimum horizontal distance between any part of the leaching system and ground
surface shall be _____.
Principle #22 Sewage or other waste from a plumbing system which may be deleterious to
surface or sub-surface waters shall not be discharged into the ground or into any
waterway, unless first rendered innocuous through subjetion to some acceptable
form of treatement.
Principle #7 This principle talks about non-absorbent plumbing fixtures
Principle #11 This principle talks about adequate circulation of air
Principle #21 This principle talks about the preservation of structural members
Black steel or black iron The common pipe material used for gas piping in residential installations; This is
also preferred for gas lines due to its strength, durability, and heat resistance
Catch basin What installation in the plumbing system is connected to separate installation of
drainage and terminated at the storm sewer? This also collects water from the
downspout and other excess water, and filters debris.
10 ft head of water for at least 15 minutes The water test shall be done with not less than _____.
minimum 34.5 kpa for at least 15 minutes The air test shall be done with __________.
14 threads per inch How many threads per inch does a pipe size of 3/4" have?
18 TPI How many threads per inch for pipe sizes of 1/4" and 3/8"?
11-1/2 TPI How many threads per inch for pipe sizes of 1" to 2"?
8 TPI How many threads per inch for pipe sizes of 2-1/2" and up?
30cm wider than pipe diameter (or, equal to the pipe outer The trench width at pipe grade should be _____.
diameter plus 12 inches.)
Leader An exterior vertical drainage pipe for conveying storm water from roof or gutter
drains; a pipe connected from building gutter to the downspout or conductor.
