A device for capturing a line passed into a cavity on a first side of a structure and retrieving the line through to a second side of the structure, the device comprising: (a) a first conduit adapted to define a pathway between the first and second sides of the structure and including: first and second lateral guide members that are opposed and each define a first surface that extends into and along the inside of the first conduit; (b) a mounting member for the first conduit; and (c) a resiliently flexible member capable of being passed through the first conduit and defining a stem portion and a loop portion in the cavity to capture said line.