3 1/8" 50 ohm 19.5' optimized expansion line assembly, flanged: Includes "O" ring, hardware. Used on TV CH 9, 10, 13, 17, 21, 25, 26, 29, 30, 33, 34, 37, 38, 42, 46, 50, 54, 58, 59, 62, 63 and 67. 54.2lbs.