Device for closing and opening by pressure the waste outlet of a sanitary fixture

A device for closing and opening by pressure a waste outlet of a sanitary fixture, the device being adapted to be housed inside a drain positionable in said waste outlet, said device comprising:

• a hollow tubular body associated or associable integrally with a plug;
• a stem at least partially housed inside said hollow tubular body,
• wherein the hollow tubular body comprises a tubular wall delimited at a first end by a lower opening and at a second end, opposite to the first end, by an upper opening,
• wherein said stem engages the lower opening, and the upper opening is at least partially engaged by said plug, said hollow tubular body being translatable with respect to the stem along a longitudinal driving axis of said device between a first position of balance or of closure of the waste outlet, in which a larger portion of the stem is stably inserted into the hollow tubular body, and a second position of balance or of opening of the waste outlet, in which a smaller portion of the stem is stably inserted into the hollow tubular body, and
• wherein said device comprises a hemispherical cage-shaped element with a plurality of arms, inside which said hollow tubular body and said stem are housed, said hemispherical cage-shaped element being provided with an upper annular base facing the plug and with a lower annular base to which said stem is connected through its free end not housed in said hollow tubular body, said lower annular base being opposite said upper annular base;
• and
• further comprising an annular gasket fitted externally on the tubular wall of said hollow tubular body adapted to be positioned in abutment against an inner wall of said upper annular base to hermetically close an entrance to the drain when said device is housed sealingly in the drain and said hollow tubular body is in the closed position, a sealing element being provided on an outer wall of said upper annular base, said sealing element being positionable in abutment against an inner wall of the drain.