x New to This Edition The following changes were made to the ninth edition of Modern Plumbing to strengthen the integrated learning solution and to remain current with professional codes: ■ ■ New chapter, Green Construction, addresses concerns such as water and resource conservation, sustainability, and green certification. ■ ■ Expanded coverage of combination hydronic boilers, geothermal heating systems, and residential fire sprinkler systems. ■ ■ Code Notes updated to correspond with the International Plumbing Code and the International Residential Code. It is important for plumbing professionals to be familiar with these codes. ■ ■■ New information on sizing DWV piping. ■ End-of-chapter materials updated using new ILS standards, which include Know and Understand, Apply and Analyze, and Critical Thinking questions to assess learning at three cognitive levels of learning. ■ ■ New LMS-ready materials provide access to commonly used LMS features and tools, and to G-W course resources in one convenient location.