ICC G27 Master Plumber with Gas Exam (2018 IPC/IFGC) Practice Exam
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Test your knowledge with 10 questions from our pool of 20 free questions.
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Full Practice Exam
Complete exam simulation matching the real Pearson VUE test format.
- 100 questions (same as real exam)
- 240 minute time limit
- 8 topic areas covered
- 440 questions in pool
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ICC G27 Master Plumber with Gas (2018 IPC/IFGC) Practice Exam Guide
What's on the exam
Questions per topic, out of 100This practice exam is built around the official content outline for the ICC G27 Master Plumber with Gas (2018 IPC/IFGC) exam: Administration General Regulations, Plumbing Fixtures, Water Supply and Distribution, Sanitary Drainage, Plumbing Vent Requirements, Traps, Interceptors, and Separators, Storm Drainage, Gas Piping.
There are two ways to practice. The free practice exam gives you 10 questions per attempt, and you can take it as many times as you like. The full practice exam gives you 100 questions on a 4 hours clock, with a new draw from our question bank each time.
Administration General Regulations 36 items
Our study plan for this topic: General Installation Requirements; Code Definitions and Terms; Plan Reading; Testing; Materials; Permits and permit applications; Inspections and inspection types; Code official authority and duties.
Plumbing Fixtures 13 items
Our study plan for this topic: Water Heaters; Water Closets and Urinals; Specialty Fixtures; Bathtubs, Showers, Sinks, and Lavatories; Minimum Number of Required Plumbing Fixtures by Occupancy; Fixture Installation Requirements and Clearances; Faucets, Fixture Fittings, and Shower Valve Standards; Flushing Devices for Water Closets and Urinals.
Water Supply and Distribution 9 items
Our study plan for this topic: Service Distribution and Piping; Water Supply and Pressure; Protection of Potable Water Supply; Pipe Materials and Approved Standards for Water Service and Distribution; Joining Methods and Connection Requirements by Pipe Material; Fixture Supply Pipe Sizing and Flow Rate Requirements; Hot Water Supply System Requirements and Temperature Controls; Valve Installation Requirements and Locations.
Sanitary Drainage 8 items
Our study plan for this topic: Building Sanitary Drainage; Sumps and Ejectors; Indirect and Special Waste Systems; Drainage pipe materials and applicable standards (above-ground, underground, and building sewer); Pipe joints and connection methods by material type; Slope, sizing, and fixture unit load calculations for drainage systems; Cleanout requirements, placement, spacing, and access; Drainage fittings, changes in direction, and prohibited connections.
Plumbing Vent Requirements 6 items
Our study plan for this topic: Vent Connections and Grades; Vent Terminals; Vent Pipe Sizing and Developed Length; Types of Venting Methods (Individual, Common, Wet, Circuit, Combination, Island, Single-Stack); Air Admittance Valves; Trap Seal Protection and Fixture Trap Distance from Vent; Vent Stack and Stack Vent Requirements; Relief Vents for Multi-Story Stacks.
Traps, Interceptors, and Separators 5 items
Our study plan for this topic: Installation of Traps; Interceptors and Separators; Trap seal depth requirements and protection methods; Prohibited trap types; Trap sizing and dimensional limits; Grease interceptor sizing and capacity requirements; Oil separator design and capacity requirements; Sand interceptors and specialty interceptors (clothes washers, bottling, slaughterhouses).
Storm Drainage 2 items
Our study plan for this topic: Storm Drainage; Sizing of vertical conductors, leaders, and horizontal storm drains using 100-year rainfall rate tables; Primary and secondary (emergency overflow) roof drain requirements and scupper sizing; Prohibited connections and disposal requirements for storm water; Approved materials for inside conductors, underground storm drain pipe, building storm sewer pipe, and subsoil drain pipe; Roof drain installation requirements and flow rate calculations for system sizing; Storm drain traps: when required, sizing, material, and cleanout requirements; Siphonic roof drainage system design standards.
Gas Piping 21 items
Our study plan for this topic: Gas Piping for Service & Distribution Piping; Gas Piping Requirements, Specific Appliances Equipment; Source of Combustion Air & Duct Openings; Fuel-burning Appliance, Vent, Connector; CSST bonding and grounding requirements; Pipe sizing methods and sizing tables (longest length, branch length, hybrid pressure); Permitted piping materials, tubing standards, and fitting types; Pressure testing procedures, test medium, duration, and leak detection.
Sample 1 — Administration General Regulations
Question: In a commercial building, a group of basement fixtures discharges into a sump that is pumped up to the building drain because the fixtures lie below the sewer invert. The portion of the drainage system serving those basement fixtures is defined as the:
- A. Building sewer
- B. Sanitary building drain
- C. Building gravity drainage system
- D. Building subdrain
Correct Answer: D
IPC Section 202 defines BUILDING SUBDRAIN as that portion of a drainage system that does not drain by gravity into the building sewer. A building gravity drainage system is one that does drain by gravity into the building sewer.
Reference: IPC 2018 Chapter 2 — Section 202, definitions of Building Subdrain and Drainage System (Building gravity)
Sample 2 — Gas Piping
Question: You are specifying the joining method for a 6-inch nominal Schedule 40 steel gas header inside a commercial boiler room. Which joining method is PROHIBITED at this pipe size?
- A. Listed press-connect fittings
- B. Threaded fittings
- C. Welded joints
- D. Flanged joints
Correct Answer: B
Per IFGC 403.10.5, Item 1, threaded fittings in sizes larger than 4 inches shall not be used. IFGC 403.10.1 permits Schedule 40 and heavier pipe to be joined by welding, flanging, brazing or with press-connect fittings listed to ANSI LC-4/CSA 6.32.
Reference: IFGC 2018 Sections 403.10.1 and 403.10.5
Sample 3 — Plumbing Fixtures
Question: You are a journeyman plumber installing a shower compartment in a residential remodel. The homeowner wants the compartment to be 26 inches wide to fit a tight space. What is the minimum least dimension permitted for a standard shower compartment?
- A. 28 inches
- B. 32 inches
- C. 30 inches
- D. 25 inches
Correct Answer: C
Per Section 421.4, shower compartments shall be not less than 30 inches in least dimension as measured from the finished interior dimension of the compartment, exclusive of fixture valves, showerheads, soap dishes, and safety grab bars or rails. The exception allows 25 inches minimum dimension only if the compartment has not less than 1,300 square inches of cross-sectional area.
Reference: IPC 2018 Section 421.4
Your first score is just a starting point. After every attempt, the results page shows how you did on each outline topic, so you can see what to work on next. Compare your score with the real exam's passing score, 70% correct, and keep at it until you pass consistently.
- Start with the questions you know. Go through the whole exam once and bookmark anything you're unsure about. Our practice exams let you bookmark and come back.
- Circle back to your bookmarks on the second pass.
- Keep an eye on your pace. The real exam works out to about 2 minutes 24 seconds per question.
- Turn every miss into a lesson. After each attempt, look up each missed question's reference in your book and read the section.
| Questions | 100 questions |
| Time limit | 4 hours |
| Passing score | 70% correct |
| Books in the exam room | Open book |
| Exam fee | $120 |
- Results for examinations taken electronically are available immediately after the examination is completed.
- You must wait 10 days before retaking a failed exam.
Source: National Contractor/Trades Examination Information Bulletin, PUBLISHED June 30, 2026; ICC Exam Catalog, checked October 6, 2026. Check the bulletin before test day: fees and rules can change.