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Texas Master Plumber Exam Study Guide – Practical Code & Fixture Calculations (120 Q&A, )

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This comprehensive study guide contains 120 exam-style questions and verified answers for the Texas Master Plumber Practical Code and Fixture Calculations Exam. Topics include trap and vent sizing, drainage pipe slopes, DFU (Drainage Fixture Unit) calculations, gas line sizing, T&P relief valve requirements, cleanout spacing, and more—all aligned with UPC (Uniform Plumbing Code) standards. Ideal for exam preparation and code reference for the 2026–2027 testing cycle.

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Texas Master Plumber Exam: Practical
Code and Fixture Calculations Exam 120
Questions And Correct Answers Already
Graded A+ 2026-2027.



Minimum size of a trap for a shower drain (Scenario 6) - ANSWER-1-1/2 inch




Water heater T&P relief valve discharge requirement - ANSWER-6 inches from

the floor




3 inch - ANSWER-A size measurement for pipes.




4 inch - ANSWER-A size measurement for pipes.




5 inch - ANSWER-A size measurement for pipes.

,6 inch - ANSWER-A size measurement for pipes.




DFUs for a 3-inch vent (UPC) - ANSWER-24




Minimum air gap for a 3/4-inch water supply pipe (Scenario 7) - ANSWER-1

inch.




Minimum slope for a 4-inch horizontal drainage pipe - ANSWER-1/4 inch per

foot




DFUs for a private bathroom water closet (UPC) - ANSWER-3




Maximum trap arm length for a 3-inch trap - ANSWER-8 feet

, Required pipe size for a gas line run of 75 feet with 175,000 BTUs demand

using 0.3 psi tables - ANSWER-1 inch




Minimum required size of a building sewer for a single-family residence -

ANSWER-4 inch




DFUs a 3-inch vent can carry (UPC) - ANSWER-36




Minimum air gap for a 3/4-inch water supply pipe - ANSWER-1 inch




Minimum burial depth of a building sewer (UPC) - ANSWER-12 inches




DFUs assigned to a bathtub (UPC) - ANSWER-2

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