Abstract: A hot and cold water plumbing fixture having a pair of water supply lines arranged parallel to each other in a fixture housing is attached to building water pipes by means of a wall fitting which includes a pair of connecting pipes disposed parallel to each other adjacent one end, and extending at a substantial angle to each other at the opposite end. The parallel end portions of such connecting pipes are of such size and spacing that they may telescope with the supply lines of the plumbing fixture. The opposite ends of the connecting pipes are attached to the building water pipes, preferably by means of a compression coupling which allows for considerable axial tolerance between the building water pipes and the pipes of the wall fitting. The plumbing fixture is attached to the wall fitting by simply telescoping the water supply lines of the fixture with the connecting pipes of the fitting, and by then locking the fixture to the fitting by means of a locking screw or other device.