Plumbers learn blueprint reading or drawings, estimate materials and install or repair water supply lines, drainage systems, and gas systems. Plumbers measure, cut, and install plastic, copper, steel, and cast iron pipe. Make connections with silver solder and a torch; or plumbing fittings; etc. Plumbers cut holes in walls, ceilings, and floors to attach or hang pipes for connection to fixtures. They also install plumbing fixtures – bathtubs, showers, sinks, and toilets – and appliances such as dishwashers and water heaters. Plumbers use numerous hand tools, like tubing cutters, torpedo levels, and various wrenches. Today’s plumbers operate power threading machines, air-acetylene torches, power drills, and saber saws. Plumbers must use their athletic capabilities. Eye-hand coordination, manual dexterity, and physical balance are important for climbing ladders or operating power tools. Thanks to safety training programs, employers have greatly reduced accidents on the job. Plumbers work outdoors and indoors – working closely with other trades.