WB00-24N Brasscraft 24" 7/8" OD Tube 3/4" FIP x 3/4" FIP Copper-Flex Water Heater Connector Patented Internal Dielectric Sleeve Effectively separates dissimilar metals within the waterway to prevent galvanic corrosion.No Dielectric Union Needed Dielectric sleeve eliminates the need for a dielectric union (plastic lined nipple).Less Torque to Seal Rubber washer is more resilient than PEX and easier to install on rough nipple surfaces.Longer Connector Nuts A greater number of thread-to-thread contact provides a better seal to lined nipples.Length 24"