When you expect simple, straightforward explanations for real-world plumbing scenarios, look no further than PLUMBING 101, 6th EDITION. This book is the first-year title in a four-year series of plumbing apprentice training books developed in partnership with the Plumbing-Heating-Cooling Contractors (PHCC) Educational Foundation. The series takes a spiral approach to address critical plumbing concepts, in which topics are introduced in the first year book, and are revisited in more detail in subsequent books in the series.