The original copper plumbing in this 1937 house in Fort Wayne, Ind., still functions in excellent working condition, according to the Copper Development Association. Other uses for copper piping in homes today include fuel gas delivery, fire sprinkler systems and cutting-edge technologies like direct exchange geothermal heating and cooling, CDA suggests. Copper comes with a 50-year manufacturers' limited warranty. If anyone reading this owns or knows of a copper plumbing system built before 1937, please contact the CDA. For more information, visit