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Master Plumber — Plumbing Principles & Law

Master Plumber board reviewer: plumbing principles and RA 1378.

Reviewer for Plumbing Principles and the Plumbing Law (RA 1378) for the Master Plumber board.

1

Basic Plumbing Principles

Plumbing protects public health by supplying safe water and removing waste. Two key systems: water supply (pressurized) and drainage (gravity).

2

The Plumbing Law (RA 1378)

RA 1378 (1955) regulates the master plumber trade. Only licensed master plumbers may design and supervise plumbing installations.

💡 Exam Hack

"The pipe shall be free from defects" — plumbing’s guiding aim is sanitation and protection of public health.

3

Plumbing Fixtures

Fixtures (sinks, water closets, lavatories) connect to supply and drainage. Each has a fixture unit value used in sizing.

4

Traps & Vents

⚠️ Common Mistake

Every fixture needs a TRAP (holds water to block sewer gas) and proper VENTING (maintains pressure so the trap seal is not siphoned).

📌 Quick Recap — Master These

Before your exam, make sure you can confidently explain and apply each of the following:

  • Basic Plumbing Principles
  • The Plumbing Law (RA 1378)
  • Plumbing Fixtures
  • Traps & Vents

Re-read any section above where you hesitate, then explain it aloud in your own words — if you can teach it simply, you understand it. Focus your final review on the tables, formulas, and the common-mistake warnings, since those are where most points are won or lost.