BrassCraft BWB20-18 3/4" MIP x 3/4" FIP x 18" Polymer Braided Water Heater Connector (0.57" I.D.) Polymer braided tube 0.57 in. I.D. X 18 in. L End connections: 3/4 in. Mip x 3/4 in. Fip Polymer fibers bend freely without kinking, crimping or flattening to make installation hassle-free