The book is targeting students and professionals who are looking to advance their fluid power careers. The book is colored and has the size of standard A4. This book is the third in a series that the author plans to publish to offer separate book for every hydraulic component. This book introduces knowledge foundation about hydraulic transmission lines. This book overviews the basic types, contamination control, safety, maintenance, troubleshooting, failure analysis, noise control, and modeling of hydraulic transmission lines.