The Plumber's Pocket Manual was designed to assist in the training of apprentices in the plumbing and pipe-fitting trades. However, we have learned through the years that the do-it-yourselfer has made good use of the manual, and we'd like to extend a welcome to all who are willing and eager to keep the plumbing working in top-notch order everywhere. Throughout the years, this manual has also been a helpful companion on the job, making work easier and more accurate. A handy reference in the toolbox or in the back pocket is always a treasure when there is a demand for information in a hurry.