A plaster-protective cover for bathroom fittings is mounted recessed in the wall, the cover being fixed to the buried part of the fitting and having an outwards-facing dome-shaped cap designed to protect the fitting parts inside it. The hole in the wall for the fitting is sealed by a collar-like sealing element which produces a watertight seal and which has, at the wall end, an annular flange which rests against the wall. The flange is embedded in a layer of sealing material applied following installation of the buried part of the fitting as the bed layer for subsequently laid tiling, and the flange thus seals off the edge of the hole pierced in the wall for the buried part of the fitting.