A pouring spout through which liquid and air pass between a supply container and a target container, the said pouring spout comprising:
- a self-venting conduit through which liquid and air pass between said supply container and said target container;
- said self-venting conduit having a proximate end, said proximate end adapted to be attached to said supply container;
- said self-venting conduit having a distal end, said distal end having at least one air intake opening and a fluid discharge opening;
- said self-venting conduit having a spout body, said spout body having a tubular configuration;
- said spout body having a proximate end and a distal end;
- said spout body having a flange on said proximate end adapted to be attached to said supply container;
- said self-venting conduit having a traveling tube, said traveling tube being of tubular configuration and being slidably received within said spout body;
- said traveling tube having a proximate end;
- said traveling tube having a flange on said proximate end, said flange sealing with said flange on said proximate end on said spout body;
- said self-venting conduit having at least one air vent channel, said air vent channel extending a length of said self-venting conduit from said proximate end to said distal end;
- said self-venting conduit having at least one air vent port, said air vent port being located adjacent to said flange on said traveling tube and corresponding with said air vent channel;
- said traveling tube having at least one liquid port, said liquid port being located adjacent to said flange on said traveling tube;
- said traveling tube having a common liquid channel, said common liquid channel extending the length of said traveling tube from said proximate end to said distal end, into which common liquid channel said liquid port opens;
- said traveling tube having an external lip on said distal end;
- said external lip of said traveling tube having an under edge;
- said self-venting conduit having a means of attachment adapted to attach said self-venting conduit to said supply container in an airtight manner;
- a valve means for regulating the transfer of air and liquid between said supply container and said target container, said valve means being normally biased in a closed position and being moveable from the closed position to an open position;
- said valve means having said means of attachment adapted to secure said flange said spout body to said supply container in an airtight manner;
- said valve means having a hook having a proximate end and a distal end, and said hook being secured in a slidable manner on said distal end of said spout body;
- said hook having a flange on said proximate end;
- said valve means having a means for biasing said valve means in the closed position by securing said hook on said spout body by urging said flange on said hook and thus said distal end of said hook against said under edge of said external lip on said traveling tube;
- said distal end of said hook being urged against said under edge said external lip on said traveling tube in turn urging said flange on said proximate end of said traveling tube against said flange on said proximate end of said spout body;
- and,
- said means for normally biasing said valve means in a closed position being moveable from a closed position to an open position by a pressure being exerted on said hook in a direction proximate of said supply containers;
- and,
- a dust cap which seats on said distal end of said pouring spout.