Book excerpt: This second edition is an in-depth illustrated manual by Master Plumber Bob Scott that continues to examine various venting methods and includes discussion and application of venting methods in the International Plumbing Code(R) (IPC(R)) and International Residential Code(R) (IRC(R)). This heavily illustrated guide shows correct and incorrect examples of common venting, horizontal and vertical wet-venting, combination waste and vent, circuit venting, single stack venting and more based on the criteria established in chapter 9 of the 2021 IPC and Chapter 31 of the 2021 IRC, as well as the 2015 and 2018 editions of the IPC and IRC. It discusses the nuances of each method in detail and gives many examples of how and where to use each method. A must have guide for any designer, installer, plan examiner, inspector or plumbing professional.