Flextron 24 Inch Lead-Free Long Stainless Steel Water Heater Connector features 3/4 Inch Inner Diameter & 3/4 Inch Female Iron Pipe (FIP) x 1 Inch Female Iron Pipe (FIP) Fittings. This connector is from FTWC series of connectors and is made of braided stainless steel. The corrugated steel connector is designed to withstand corrosion and the deep corrugations provide structural support against crushing, kinking and cracking. Manufactured from a seamless copper pipe, with an external dielectric sleeve and nitrile rubber sealing washer that meets NSF standards. This connector is flexible enough to cope with seismic shifts without breaking and durable enough for the long haul with a tough exterior that resists corrosion. The connectors are the perfect fit for boilers, water heaters, and tankless water heaters.