7Designed for your third year as a plumbing apprentice, PLUMBING 301, Second Edition, combines a visually appealing, full-color design, clear writing style, and the most current plumbing and gas code references to give you everything you need to know for both commercial and residential plumbing. Coverage begins with basic installation practices; progresses to blueprint reading, the National Fuel Gas Code, and surveying instruments; and includes special chapters devoted to the math and science of plumbing. The Second Edition builds on this thorough foundation with new discussions of hydronic systems, LP gas systems, ejector systems, water treatment, and electrical controls and wiring, plus enhanced content on preplanning and electrical controls. Now better than ever, this valuable text gives you the tools you need to be successful as you continue your journey into the plumbing industry. Check out our app, DEWALT Mobile Pro�. This free app is a construction calculator with integrated reference materials and access to hundreds of additional calculations as add-ons. To learn more, visit dewalt.com/mobilepro.