Abstract: A fitting includes a positioning plate with a major mounting wall for fixing on an upright wall, and an annular anchoring wall. A faceplate includes a first major wall defining a bore, and an annular anchored wall surrounding and shielding the annular anchoring wall, and secured to the annular anchoring wall in a radial direction. A first cover member includes a first orientation wall defining a through hole larger than the bore, and a first skirt portion abutting against the faceplate. Apad member is made of a deformable material, and includes a second orientation wall defining an opening smaller than the through hole, a second skirt portion abutting against the first skirt portion, and a tubular portion integrally formed with the rear orientation surface and inserted into the through hole. The tubular portion defines an inner axial through hole communicating with the opening.