Texas Plumbing Journeyman Exam
Study Guide 2025/2026 –
Plumbing Definitions, Installation
Codes, and Practice Questions.
Course
Texas Plumbing Journeyman
1. What is a plumbing fixture?
A. A pipe fitting used to connect drainage systems
B. A receptacle or device that receives water, waste, or both and discharges them into a plumbing
system
C. A valve used to regulate pressure
D. A type of water heater
Correct Answer: B
Explanation: Plumbing fixtures include sinks, toilets, lavatories, showers, and bathtubs
connected to the plumbing system.
2. What is the primary purpose of a P-trap?
A. Increase water pressure
B. Prevent sewer gases from entering a building
C. Speed up drainage flow
D. Filter drinking water
Correct Answer: B
Explanation: The water seal inside a P-trap prevents harmful sewer gases from entering
occupied spaces.
3. According to plumbing code principles, what is the minimum slope commonly required
for a 3-inch horizontal drainage pipe?
A. 1/8 inch per foot
B. 1/4 inch per foot
C. 1 inch per foot
D. 2 inches per foot
Correct Answer: B
, Explanation: Most plumbing codes require a minimum slope of 1/4 inch per foot for drainage
piping up to certain sizes to ensure proper flow.
4. What is a cleanout?
A. A vent fitting
B. A removable access point that allows inspection and cleaning of drainage piping
C. A water treatment device
D. A pressure regulator
Correct Answer: B
Explanation: Cleanouts provide access for maintenance and clearing blockages within drainage
systems.
5. What is the purpose of a vent pipe?
A. Increase water temperature
B. Supply air to the drainage system and protect trap seals
C. Filter wastewater
D. Control water pressure
Correct Answer: B
Explanation: Venting equalizes pressure within the drainage system and prevents trap
siphonage.
6. Which fitting is commonly used to change the direction of pipe flow by 90 degrees?
A. Coupling
B. Bushing
C. Elbow
D. Union
Correct Answer: C
Explanation: Elbows are designed to change pipe direction, commonly at 45° or 90° angles.
7. What is the purpose of a backflow prevention device?
Study Guide 2025/2026 –
Plumbing Definitions, Installation
Codes, and Practice Questions.
Course
Texas Plumbing Journeyman
1. What is a plumbing fixture?
A. A pipe fitting used to connect drainage systems
B. A receptacle or device that receives water, waste, or both and discharges them into a plumbing
system
C. A valve used to regulate pressure
D. A type of water heater
Correct Answer: B
Explanation: Plumbing fixtures include sinks, toilets, lavatories, showers, and bathtubs
connected to the plumbing system.
2. What is the primary purpose of a P-trap?
A. Increase water pressure
B. Prevent sewer gases from entering a building
C. Speed up drainage flow
D. Filter drinking water
Correct Answer: B
Explanation: The water seal inside a P-trap prevents harmful sewer gases from entering
occupied spaces.
3. According to plumbing code principles, what is the minimum slope commonly required
for a 3-inch horizontal drainage pipe?
A. 1/8 inch per foot
B. 1/4 inch per foot
C. 1 inch per foot
D. 2 inches per foot
Correct Answer: B
, Explanation: Most plumbing codes require a minimum slope of 1/4 inch per foot for drainage
piping up to certain sizes to ensure proper flow.
4. What is a cleanout?
A. A vent fitting
B. A removable access point that allows inspection and cleaning of drainage piping
C. A water treatment device
D. A pressure regulator
Correct Answer: B
Explanation: Cleanouts provide access for maintenance and clearing blockages within drainage
systems.
5. What is the purpose of a vent pipe?
A. Increase water temperature
B. Supply air to the drainage system and protect trap seals
C. Filter wastewater
D. Control water pressure
Correct Answer: B
Explanation: Venting equalizes pressure within the drainage system and prevents trap
siphonage.
6. Which fitting is commonly used to change the direction of pipe flow by 90 degrees?
A. Coupling
B. Bushing
C. Elbow
D. Union
Correct Answer: C
Explanation: Elbows are designed to change pipe direction, commonly at 45° or 90° angles.
7. What is the purpose of a backflow prevention device?
