Abstract: Safeguard cap structure particularly for bottles, comprising a cylindrical hollow body which can be associated in sealing engagement with the neck of a bottle. A plurality of flexible reeds extending longitudinally in the hollow body in the proximity of the free edge thereof. A shut off disc supported by said reeds defines, in cooperation with the mentioned free edge, outlet ports for the issuing of a liquid from the bottle. A covering hood is in screwed engagement with the mentioned hollow body. A plurality of short and substantially rigid appendages and a plurality of long and substantially flexible appendages intervening between the short ones are part of the cap structure. The appendages extend radially from the periphery of the shut off disc, projections being provided peripherally along the inner bottom of the covering hood and adapted to engage the long and substantially flexible appendages during the rotation of the covering hood.