Laundry treatment appliance comprising: a rigid tub ( 120, 120a, 120b) for containing laundry treatment liquids, the tub comprising a tub outlet for draining the treatment liquids therefrom, a manifold comprising a manifold inlet coupled with the tub outlet for receiving said treatment liquids, and a gasket arranged between said manifold inlet and said tub outlet for sealingly coupling thereof, the laundry treatment appliance further comprising a floating valve, pivotally hinged to said gasket, adapted to swing between a closed position wherein the floating valve abuts a valve seat ( 150s-550s) associated with the gasket thereby impeding the passage of the treatment liquids from said tub ( 120, 120a, 120b) to said manifold, and an opened position wherein the floating valve is at least partially spaced from said valve seat ( 150s-550s) thereby allowing the treatment liquids to pass from said tub ( 120, 120a, 120b) to said manifold, said floating valve and said valve seat ( 150s-550s) having different rigidity; wherein said floating valve is provided with at least one wall ( 160, 165, 360, 365, 460, 465) that extends from a rear side of said floating valve opposite to an abutment side thereof, said at least one wall ( 160, 165, 360, 365, 460, 465) delimiting one or more air capturing chambers ( 155 C i, 355 C i, 455 C i) adapted to capture air thereby enhancing floating of said floating valve.. characterized in that said at least one wall ( 160, 165, 360, 365, 460, 465) comprises a rectilinear wall portion ( 160p, 360p) arranged in proximity to an hinging region of said floating valve to said gasket, and substantially parallel to an hinge axis ( X H) of said floating valve to said gasket, said rectilinear wall portion ( 160p, 360p) hindering, during floating valve opening, the escaping from said one or more capturing chambers ( 155 C i, 355 C i, 455 C i) of the air captured therein. a rigid tub ( 120, 120a, 120b) for containing laundry treatment liquids, the tub comprising a tub outlet for draining the treatment liquids therefrom, a manifold comprising a manifold inlet coupled with the tub outlet for receiving said treatment liquids, and a gasket arranged between said manifold inlet and said tub outlet for sealingly coupling thereof, the laundry treatment appliance further comprising a floating valve, pivotally hinged to said gasket, adapted to swing between a closed position wherein the floating valve abuts a valve seat ( 150s-550s) associated with the gasket thereby impeding the passage of the treatment liquids from said tub ( 120, 120a, 120b) to said manifold, and an opened position wherein the floating valve is at least partially spaced from said valve seat ( 150s-550s) thereby allowing the treatment liquids to pass from said tub ( 120, 120a, 120b) to said manifold, said floating valve and said valve seat ( 150s-550s) having different rigidity; wherein said floating valve is provided with at least one wall ( 160, 165, 360, 365, 460, 465) that extends from a rear side of said floating valve opposite to an abutment side thereof, said at least one wall ( 160, 165, 360, 365, 460, 465) delimiting one or more air capturing chambers ( 155 C i, 355 C i, 455 C i) adapted to capture air thereby enhancing floating of said floating valve.. characterized in that said at least one wall ( 160, 165, 360, 365, 460, 465) comprises a rectilinear wall portion ( 160p, 360p) arranged in proximity to an hinging region of said floating valve to said gasket, and substantially parallel to an hinge axis ( X H) of said floating valve to said gasket, said rectilinear wall portion ( 160p, 360p) hindering, during floating valve opening, the escaping from said one or more capturing chambers ( 155 C i, 355 C i, 455 C i) of the air captured therein.