- A faucet comprising: - an inner body, the lower part of which is configured to be connected to at least one water inlet pipe (7a, 7b); - an outer casing having a top opening, a bottom opening and a lateral orifice provided below the top opening, the inner body being configured to be inserted into the outer casing via the bottom opening of the outer casing; - a cap configured to be mounted in the top opening of the outer casing; and - an aerator fitting support configured to carry an aerator fitting and to be inserted into the outer casing via the lateral orifice of the outer casing; characterized in that: - the aerator fitting support has at least two longitudinal outer ribs capable of engaging, when the cap is mounted in the top opening of the outer casing and the aerator fitting support is inserted through the lateral orifice of the outer casing, into at least two mortises located in the lower part of the cap, so that the aerator fitting support locks the position of the cap in the outer casing; - when the aerator fitting support is engaged into the cap, the upper part of the inner body is configured to engage into the lower part of the aerator fitting support when the inner body is inserted through the bottom opening of the outer casing, so that the inner body locks the position of the aerator fitting support in the outer casing; and - a bore is radially provided in the inner body, and a lateral through hole is provided in the outer casing, said lateral through hole facing said bore when the inner body is installed in the outer casing, at least one of said lateral through hole and said bore being threaded, the faucet further comprising a locking screw configured to be inserted into said lateral through hole and said bore when the inner body is installed in the outer casing so as to lock the position of the inner body in the outer casing, the axis of said bore and said lateral through hole preferably being in a horizontal plane with respect to the base of the inner body and the outer casing. - an inner body, the lower part of which is configured to be connected to at least one water inlet pipe (7a, 7b); - an outer casing having a top opening, a bottom opening and a lateral orifice provided below the top opening, the inner body being configured to be inserted into the outer casing via the bottom opening of the outer casing; - a cap configured to be mounted in the top opening of the outer casing; and - an aerator fitting support configured to carry an aerator fitting and to be inserted into the outer casing via the lateral orifice of the outer casing; - the aerator fitting support has at least two longitudinal outer ribs capable of engaging, when the cap is mounted in the top opening of the outer casing and the aerator fitting support is inserted through the lateral orifice of the outer casing, into at least two mortises located in the lower part of the cap, so that the aerator fitting support locks the position of the cap in the outer casing; - when the aerator fitting support is engaged into the cap, the upper part of the inner body is configured to engage into the lower part of the aerator fitting support when the inner body is inserted through the bottom opening of the outer casing, so that the inner body locks the position of the aerator fitting support in the outer casing; and - a bore is radially provided in the inner body, and a lateral through hole is provided in the outer casing, said lateral through hole facing said bore when the inner body is installed in the outer casing, at least one of said lateral through hole and said bore being threaded, the faucet further comprising a locking screw configured to be inserted into said lateral through hole and said bore when the inner body is installed in the outer casing so as to lock the position of the inner body in the outer casing, the axis of said bore and said lateral through hole preferably being in a horizontal plane with respect to the base of the inner body and the outer casing.