Throughly updated with the assistance of seventeen master plumbers, this third edition introduces readers to all aspects of the commercial and residential plumbing trades, including home building. An excelent study guide for plumbers preparing to pass the "master plumb" exam, this edition features updated coverage of all plumbing codes. Each unit of this book contains new and improved summaries, plus "Test your Understanding" quizzes with answers in the apendix, to clarify and reinforce more dificult concepts. In addition, projects located throughout the book provide opportunities for hands-on plumbing practice and actual application of concepts. As such, readers gain an understanding of both the "why" and the "how" of plumbing design and installation.