Plumbing Vent Practice Questions
Why every trap is vented, vent rise and grade, vent sizing, terminals near openings and on roofs, common and wet vents, stack vents and vent stacks, and air admittance valves.
100 questions in 2 hours, scored against the 70% pass mark, with a score for vents so you know where you stand.
Free vents drillOpen vent terminals are designed to release sewer gas:
Vents on the journeyman plumber exam
The vent chapter covers why vents are needed and how a complete vent system is put together. TSBPE lists vent types and components, terminals, grading, connections to drainage, and wet venting on one floor versus floors above; ICC’s Vents area is 7% of G25.
- On our mocks
- Texas: 10 of 100 on our Texas mock · ICC G25: 5 of 70 on our ICC G25 mock
- Our drill
- 10 questions from 38 vents questions, untimed, an explanation and code reference after every answer; one free attempt, unlimited with a pass
What vents questions test
- Purpose: protecting trap seals from siphonage and back pressure and carrying sewer gas outdoors
- Connections: rising 6 inches above the flood level rim before running horizontally, taking vents off above the drain’s centerline, grading back to the drain
- Sizing: at least 1-1/4 inches and half the drain served; trap-to-vent distances in the IPC table
- Terminals: 10 feet from or 3 feet above openings, 7 feet above occupied roofs, frost closure
- Vent types: common, wet, circuit and relief vents, stack vents and vent stacks, and IPC air admittance valves
Sit the full exam under the real clock
100 questions in 2 hours, scored against the 70% pass mark, with a score for vents so you know where you stand.
Free vents drillHow to study it
- Draw a two-story bathroom stack with its stack vent, vent stack and branch vents, the same system the Texas practical asks you to build.
- Learn the three ways a trap loses its seal to siphonage and back pressure, and which vent prevents each.
- If your exam uses the IPC, memorize Table 909.1 trap arm lengths.
Common questions
How high above the fixture must a vent rise before it turns horizontal?
At least 6 inches above the flood level rim of the highest fixture it serves, in both codes.
Are air admittance valves allowed?
The IPC allows them with conditions: accessible, at least 4 inches above the drain they vent, and with at least one vent open to the outdoors for each building drain. Check your local code.
100 questions in 2 hours, scored against the 70% pass mark, with a score for vents so you know where you stand.
Free vents 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
- Traps, Interceptors and Separators
- 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.