Traps, Interceptors and Separators Practice Questions
Trap seal depth, prohibited traps, how seals are lost, trap primers, shared traps, and grease, oil, lint and sand interceptors.
100 questions in 2 hours, scored against the 70% pass mark, with a score for traps and interceptors so you know where you stand.
Free traps and interceptors drillHydromechanical grease interceptors generally need which device on their inlet side to work as rated?
Traps, Interceptors and Separators on the journeyman plumber exam
TSBPE’s traps chapter covers trap design, fixture traps, protecting trap seals and prohibited traps. ICC’s Traps, Interceptors and Separators area (7% of G25) adds interceptors and separators.
- On our mocks
- Texas: 7 of 100 on our Texas mock · ICC G25: 5 of 70 on our ICC G25 mock
- Our drill
- 10 questions from 25 traps and interceptors questions, untimed, an explanation and code reference after every answer; one free attempt, unlimited with a pass
What traps and interceptors questions test
- Trap seals of 2 to 4 inches and the 24-inch limit from fixture outlet to trap weir
- Prohibited traps: S-traps, bell traps, drum traps, traps with moving parts, crown-vented traps and double traps
- How seals are lost: self-siphonage, induced siphonage, back pressure, evaporation and capillary action
- Shared traps for up to three adjacent lavatories or sink compartments within 30 inches, and trap primers
- Grease interceptors and flow controls, oil separators for garages, lint interceptors for laundries
Sit the full exam under the real clock
100 questions in 2 hours, scored against the 70% pass mark, with a score for traps and interceptors so you know where you stand.
Free traps and interceptors drillHow to study it
- List what makes a trap acceptable: self-cleaning, water seal only, set level, no larger than its drain.
- Pair each kind of interceptor with the business that needs it.
Common questions
How deep is a trap seal?
At least 2 inches and not more than 4 inches in both codes, except where a deeper seal is specifically approved.
Can a food waste disposer drain to a grease interceptor?
Not directly. Ground food fills a grease interceptor, so the IPC prohibits the connection and the UPC allows it only through a solids interceptor first.
100 questions in 2 hours, scored against the 70% pass mark, with a score for traps and interceptors so you know where you stand.
Free traps and interceptors drillThe other sections
- Code Definitions and Plan Reading
- General Regulations, Testing and Plumbing Math
- Pipe Materials and Joints
- Plumbing Fixtures
- Water Heaters
- Water Supply and Distribution
- Sanitary Drainage
- Vents
- Storm Drainage
- Fuel Gas Piping
- Texas Plumbing License Law and Board Rules
- Texas practice exam (100 questions, 2 hours)
- ICC G25 practice exam (70 questions, 4 hours)
- Free Texas mixed drill
Sources
- Pearson VUE: Texas State Board of Plumbing Examiners (retake waits, practical, five attempts)
- TSBPE Candidate Handbook, August 2025 (exam table, fees, 70% passing score, test-center rules)
- TSBPE Journeyman Plumber Examination Review Course, rev 09/2025 (format, codes, chapters, sample questions)
- TSBPE Administrative Rules, March 2026 (22 TAC §§363.5, 363.22, 365.1, 367.2)
- TSBPE proposed amendment to §367.2 (2021 IPC and UPC), Texas Register, August 14, 2026
- TSBPE Strategic Plan 2025-2029 (examination statistics, p. 14)
- ICC National Contractor/Trades Examination Information Bulletin, published June 30, 2026 (G25 Journeyman Plumber)
- ICC Support: What is a passing score?
Original practice questions written to the TSBPE Journeyman Plumber Examination Review Course, ICC’s G25 content outline and the 2018 International Plumbing Code and Uniform Plumbing Code; they are not exam questions and quote no code text. Independent practice, not affiliated with or endorsed by the Texas State Board of Plumbing Examiners, the International Code Council, IAPMO or Pearson VUE.