3This book takes a spiral approach to address critical plumbing concepts, in which topics are introduced in the book. This is ideal for anyone new to the field, as it mimics the most common learning experience: as plumbing apprentices and professionals gain more field experience, they gain more in-depth knowledge. This first book encompasses both residential and commercial plumbing, with core content centering on basic plumbing principles and codes. The end result is for new plumbing apprentices or professionals with more value than ever.