Oklahoma Residential Journeyman Plumbing and Natural Gas
Code edition notice: Oklahoma's PSI candidate bulletin (effective August 31, 2026) allows either the 2018 or the 2024 edition of the International Residential Code (IRC) on this exam from September 14, 2026 through December 13, 2026. Starting December 14, 2026, only the 2024 editions are permitted.
This practice exam now cites the 2024 edition section numbers. If you are studying from the 2018 book, most section numbers are unchanged; the Chapter 1 administrative sections were renumbered in 2024. If you test on or after December 14, 2026, study from and bring the 2024 books.
Practice at the real exam's pace
Every practice exam shows your time per question against the real exam's clock (2:07 here), and each topic lands in one of these:
What's on the exam
Questions per topic, out of 85Topics
General Plumbing Knowledge and Regulations
This topic includes a study brief covering key concepts and common mistakes — plus a 25-question practice quiz.
Piping, Valves, and Control Valves
This topic includes a study brief covering key concepts and common mistakes — plus a 24-question practice quiz.
Fixtures and Equipment
This topic includes a study brief covering key concepts and common mistakes — plus a 24-question practice quiz.
Water Supply
This topic includes a study brief covering key concepts and common mistakes — plus a 25-question practice quiz.
Drains and Sewers
This topic includes a study brief covering key concepts and common mistakes — plus a 25-question practice quiz.
Vents
This topic includes a study brief covering key concepts and common mistakes — plus a 25-question practice quiz.
Traps, Interceptors, Indirect, and Special Waste
This topic includes a study brief covering key concepts and common mistakes — plus a 15-question practice quiz.
Isometric Analysis
This topic includes a study brief covering key concepts and common mistakes — plus a 21-question practice quiz.
Fuel Gas
This topic includes a study brief covering key concepts and common mistakes — plus a 25-question practice quiz.
Safety
This topic includes a study brief covering key concepts and common mistakes — plus a 12-question practice quiz.