Tap for dispensing liquids from vessels

A tap for dispensing liquids from a vessel, comprising:

• a) a body made in a single piece comprising a supporting member from which a head projects, said head being equipped with at least one first mouth for dispensing liquids and at least one second mouth for entering air inside said vessel in parallel to liquid going out of said vessel;
• at least one resilient thrusting member adapted to allow or prevent liquids from being dispensed;
• and winged abutting means;
• b) at least one valve member contained inside said body and adapted to engage at one end an outlet mouth of said vessel in order to open and close the outlet mouth, said valve member being adapted to engage said at least one resilient thrusting member to open and close an opening for dispensing liquids;
• and
• c) at least one warranty seal adapted to prove the lack of tampering of the tap;
• wherein said warranty seal comprises at least one first cover for said resilient member and one second cover for said first or second mouth of said head, said first cover being hingedly connected, through a first arm and being made in a single piece with said body, said first cover being connected through a second arm to said second cover.