Wall-mounted elbow duct

A wall-mounted elbow duct comprising an elbow duct, a reverse checking means, a coupler and a coupling cap, wherein:

• the elbow duct has one end forming an external threaded portion to be fastened to a wall-mounted water discharge pipe and another end forming a coupling seat, the coupling seat having a housing chamber to hold the reverse checking means and two opposing jutting ribs on two outer edges, the housing chamber having an internal screw hole;
• the reverse checking means includes a first coupling ring, a first washer, a second washer and a second coupling ring;
• the coupler has one end forming a first threaded portion corresponding to the internal screw hole of the elbow duct and another end forming a second threaded portion to be fastened to a hose connector of a hand-held shower head;
• and
• the coupling cap for covering the wall-mounted water discharge pipe and the elbow duct, and has an outer surface to conceal the wall-mounted water discharge pipe and the elbow duct and two detention flutes corresponding to and wedged in by the jutting ribs.