A first coupler part (12) is fastened to a wall (W) by a first pair of screw fasteners (32, 34). The screw fasteners (32, 34) have heads that bear against surface portions of the first coupler part (12) that immediately surround openings (28, 30) that receive the screw fasteners (32, 34). A second coupler part (14) is connectable to the surface (20) of first coupler part (20) that is directed away from the wall (W). When the second coupler part (14) is moved against the first coupler part (12), the heads of the screw fasteners (32, 34) enter into enlarged openings (68, 70) in the second coupler part (14). This allows the surface (48) of the second coupler part (14) to be moved against the surface (20) of the first coupler part (12). The second pair of fasteners (40, 42) are used to connect the second coupler part (14) to the first coupler part (12). Or, the second screw fasteners (40, 42) may extend through openings in the first coupler part and screw into openings in the wall (W). Either way, the second coupler part (14) can be quickly and easily detached from the first coupler part (12) by simply removing the two screws (40, 42). The second coupler part (14) can be thus removed for purpose of the pair or placement without disturbing the connection between an optical fiber cable (82) and the first coupler part (12).