How it Works... by  New Jersey Sewer Contractors Whether you are getting in to new project and would like to learn and see how in reality things will look during the process and upon completion or if you curious to learn how plumbing sewer drain trenchless water works and operates and the process of repair replacement installation services work the following are some video and illustrations so you can learn how. ------- If you need to take care of your plumbing issues call us today, we will show you we take our customer’s needs seriously.