Know the system of plumbing

		 A plumber is someone who installsor repairs piping systems, plumbing fixtures and equipment such as waterheaters and backflow preventers. 

Plumbing equipment includes devices often hiddenbehind walls or in utility spaces which are not seen by the general public. Itincludes water meters, pumps, expansion tanks, backflow arrestors, waterfilters, UV sterilization lights, water softeners, water heaters, heatexchangers, gauges, and control systems.

Specialized plumbing tools include pipe wrenches,flaring pliers, and joining tools such as soldering torches and crimp tools.New tools have been developed to help plumbers fix problems more efficiently.For example, plumbers use video cameras for inspections of hidden leaks orproblems, they use hydro jets, and high pressure hydraulic pumps connected tosteel cables for trench-less sewer line replacement.

The major categories of plumbing  systems or subsystemsare:

Potable cold and hot tap water supply

Plumbing drainage venting

Septic systems

Rainwater, surface, and subsurface water drainage

Fuel gas piping

For their environmental benefit and sizableenergy savings, hot water heat recycling units are being installed inresidential buildings. Ecological concerns and water shortages have increasedinterest in graywater recovery and treatment systems.

Plumbing may also include hydronics, whichinvolves heating and cooling systems utilizing water to transport thermalenergy.

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