There are different specialties in the field of plumbing, though they are all related in some way. Their relation is in the sense that most of them revolve around installation of systems of plumbing and drainage as well as services involving portable water. Installation of gas systems is also one of the jobs of a plumber. Therefore before hiring a plumber you need to first understand the exact kind of services that you need.
A plumber is a specialist who deals with the installation and maintenance of pipelines and other forms of piping. The pipelines are used to supply households and the commercial buildings with water and other fluids. Petroleum products are a part of the man commodities transported by the pipelines. The drainage systems carry away the water-borne wastes to avoid contamination in households.
A Magnetic field is used by Minneapolis plumbing contractors, in order to create electrical currents which power industrial and home water and electrical appliances. It is completely possible to use any simple battery to stimulate a charge in coils that will then create power. Solenoid is also the technical word for a loop of long coil wire wrapped within a metallic core so it produces a uniform magnetic field.