Abstract: A conduit threading device is provided for passing a pull-cord (24) through a conduit (17) by imposing suction at one end of a conduit to draw a shuttle (16) having a zone of maximum diameter that is commensurate with the internal diameter of the conduit and that is introduced at the other end of the conduit, through the conduit. The conduit threading device includes a positive, displacement pump (1), typically a hand operated piston and cylinder pump, having a suction inlet (14) generally at the end of a flexible suction 10 pipe (13) configured for releasable attachment, by way of one of a selection of adapters, to an end of a conduit. Interposed between the pump and suction inlet is a separate collection chamber (9) for waste solids and liquids drawn into the suction inlet during use. The pull-cord is preferably a light weight polypropylene string, or the like.