Charlotte home inspector Preston Sandlin recently inspected a house that had two different types of plumbing pipes in use. Fortunatuately the Charlotte homeowner did not have them connected directy to each other or he would have had a dielectric connection. What is a dielectric connection and how do you avoid it? If you put two metals together in water, one of them corrodes to protect the other. This is known as electrolysis. The action of a sacrificial anode rod, and that of a battery, are both examples of beneficial electrolysis. However, usually in plumbing, electrolysis is something you want to avoid, especially in connections, since it means that the corroding part is eventually going to leak. http://www.homeinspectioncarolina.com/ http://www.askthecharlotteinspector.com/