Abstract: A tool is provided for installing an optical fibre transmission line between the inside of a customer's premises and the outside thereof along a pre-installed tubular pathway which passes through an aperture in a wall of said premises. The tool comprising a housing, a motor mounted within the housing, a motor output shaft, and a pair of drive wheels. At least one of the drive wheels is drivably connected to the output shaft of the motor. The drive wheels are mounted on the housing for relative movement towards/away from one another, whereby the optical fibre transmission line can be driven along the tubular pathway by the inter-engagement of the counter-rotating drive wheels. The tool may incorporate an air injector unit for propelling the transmission line along the tubular pathway by fluid drag of air passed through the pathway.