What Does a Plumber Do? Generally, plumbers install and repair water and sewer systems regular plumbing maintenance plans. They may also install plumbing fixtures and appliances. They also may be involved in designing plumbing systems. Plumbers must know plumbing codes and regulations. Plumbers must have a valid license to work in most states. They may be self-employed or work for a plumbing contractor. They may travel long distances to various work sites. Their work often involves working outside in inclement weather. Plumbers can be trained through an apprenticeship program. These programs are usually sponsored by a plumbing contractor or a local union. They usually take four to five years to complete. In some cases, plumbers can also take additional courses to become a master plumber. Plumbers need to be able to lift heavy equipment. They may also need to use pipe cutters to size pipes accurately. They also need to know how to test for leaks and how to repair pipes. Plumbers may also work with pipe fittings using threaded fittings, soldering techniques, and solvent welds. A successful Plumber is a good problem solver. They must have good communication skills and must be able to identify issues within a system. They also need to have a good understanding of building codes and regulations. They must be able to design plumbing systems that offer clean water. They must also be able to explain their work to customers. Some Plumbers also specialize in a certain field, such as air conditioning, ventilation, or home remodeling. These Plumbers may also become instructors at local colleges or tutors in their field.