A vented pouring spout for a liquid-storage container, the spout including: a main body including: - a first member and a second member that extends from a side of the first member, the first member having opposite first and second open ends (120a, 120b), the first member including a liquid chamber and a housing that are separated by an internal partition inside the first member; - a liquid circuit passing inside the liquid chamber and then inside a liquid passageway that extends within the second member, the liquid circuit entering the liquid passageway from the liquid chamber through a side opening of the first member; - an air circuit segregated from the liquid circuit and positioned along a top inner side of the main body, the air circuit passing through an air passageway including a first segment, a second segment and a third segment disposed in juxtaposition inside the first member, the first segment being positioned inside the second member, the second segment interconnecting the first and third segments (240, 244); and a valve system movable between a normally closed position and a fully opened position, the valve system including: - a valve member engaging the first open end of the first member in the normally closed position; - two spaced-apart and parallel stems projecting from an inner side of the valve member into the first member, each stem extending longitudinally inside the first member and being slidably engaged into a corresponding opening made through the partition, each stem passing on a respective lateral side of the second segment of the air passageway; - a push button mounted within the housing and being in an axial force-transmitting engagement with the valve member at least through the stems; and - a biasing element located inside the housing to urge the valve member in the normally closed position. a main body including: - a first member and a second member that extends from a side of the first member, the first member having opposite first and second open ends (120a, 120b), the first member including a liquid chamber and a housing that are separated by an internal partition inside the first member; - a liquid circuit passing inside the liquid chamber and then inside a liquid passageway that extends within the second member, the liquid circuit entering the liquid passageway from the liquid chamber through a side opening of the first member; - an air circuit segregated from the liquid circuit and positioned along a top inner side of the main body, the air circuit passing through an air passageway including a first segment, a second segment and a third segment disposed in juxtaposition inside the first member, the first segment being positioned inside the second member, the second segment interconnecting the first and third segments (240, 244); and - a first member and a second member that extends from a side of the first member, the first member having opposite first and second open ends (120a, 120b), the first member including a liquid chamber and a housing that are separated by an internal partition inside the first member; - a liquid circuit passing inside the liquid chamber and then inside a liquid passageway that extends within the second member, the liquid circuit entering the liquid passageway from the liquid chamber through a side opening of the first member; - an air circuit segregated from the liquid circuit and positioned along a top inner side of the main body, the air circuit passing through an air passageway including a first segment, a second segment and a third segment disposed in juxtaposition inside the first member, the first segment being positioned inside the second member, the second segment interconnecting the first and third segments (240, 244); and a valve system movable between a normally closed position and a fully opened position, the valve system including: - a valve member engaging the first open end of the first member in the normally closed position; - two spaced-apart and parallel stems projecting from an inner side of the valve member into the first member, each stem extending longitudinally inside the first member and being slidably engaged into a corresponding opening made through the partition, each stem passing on a respective lateral side of the second segment of the air passageway; - a push button mounted within the housing and being in an axial force-transmitting engagement with the valve member at least through the stems; and - a biasing element located inside the housing to urge the valve member in the normally closed position. - a valve member engaging the first open end of the first member in the normally closed position; - two spaced-apart and parallel stems projecting from an inner side of the valve member into the first member, each stem extending longitudinally inside the first member and being slidably engaged into a corresponding opening made through the partition, each stem passing on a respective lateral side of the second segment of the air passageway; - a push button mounted within the housing and being in an axial force-transmitting engagement with the valve member at least through the stems; and - a biasing element located inside the housing to urge the valve member in the normally closed position.