Plumbing Service and Repair: The installation of plumbing systems in new construction is a majority of the work performed by pipe trades journeyworkers and apprentices. Once these new piping systems and fixtures are installed, they must be maintained and serviced. Maintenance and service represent a high percentage of the total amount of work performed in the plumbing industry. A primary shop class that is hands-on with an aggressive shop schedule helps to get the student into the service industry. The instruction in faucet repair or replacement, water closet tank type and flush valve, trap replacement, and shower valve repair will help to prepare an apprentice for the repair of basic plumbing fixtures.