Panduit FiberRunner® TrumpetPanduit FiberRunner Trumpet Bend Radius Control for 3 Inch Exit The FiberRunner Bend Radius Control Trumpet is a precision engineered accessory designed to protect and manage fiber and other high performance cables as they exit a ready to run conduit system. Specifically developed to limit the bend radius to 3 inches (76. 2 mm) when exiting from a 12x4 channel or a 12x4 horizontal tee, this trumpet helps preserve signal integrity, reduce cable