To improve an aesthetic appearance of an indoor area, attain an effective utilization of the indoor area and prevent an accidental operation from a front surface of a wall by a method wherein an opening or closing valve is arranged at a rear surface of the wall adjacent to the front surface of the wall.
There are provided a coupler 21 in which a flexible cold water or hot water feeding pipe 33 arranged at a rear surface of a wall is connected to one end thereof and having a connecting section 9 acting as a connecting port at the other end mounted at the rear surface of the wall toward the front surface of the wall, and an opening or closing valve 4 for controlling a supplying of hot water to the coupler 2. This is further comprised of a valve 3 where an operating section 5 for performing an opening or closing operation of the opening or closing valve 4 is mounted at the rear surface of the wall toward the front surface and an ornamental cover 21 fixed to the front surface of the wall to cover the operating section 5 and having a cover 23 which can be opened or closed to cause the operating section 5 to be placed adjacent to the front surface of the wall, wherein the cover 23 of the ornamental cover 21 is opened in cooperation with a connection of a connected member to the connecting section 9 of the coupler 2 from the front surface of the wall and further closed in cooperation with a releasing of the connection of the connecting member.