What are dielectric fittings and connectors?
When fittings of unlike metals are joined together (copper with brass, brass with steel, etc.) the faint electrical current that is present in any water pipe system will cause erosion of the threads in one or both of the fittings and cause leaking. The plastic liner or sleeve in the dielectric fittings and connectors prevents this from happening. Note: Stainless steel fittings and connectors are naturally dielectric and do not need the plastic lining.
