A hydrokinetic torque coupling device for coupling together a driving shaft and a driven shaft, comprising: a casing rotatable about a rotational axis, the casing comprising a casing shell and an impeller shell disposed axially opposite to the casing shell; a piston engagement member non-rotatably coupled to the casing and including an annular reaction plate (28 2) extending radially inwardly from the casing, the reaction plate (28 2) having a first engagement surface (29 1); an impeller coaxial with the rotational axis and comprising the impeller shell; a turbine-piston coaxial with and axially moveable along the rotational axis and hydro-dynamically drivable by the impeller, the turbine-piston comprising a turbine-piston shell including a turbine-piston flange having a second engagement surface (39 2) movable axially toward and away from the first engagement surface (29 1) of the piston engagement member to position the hydrokinetic torque coupling device respectively into and out of a lockup mode in which the turbine-piston is mechanically locked with the casing so as to be non-rotatable relative to the piston engagement portion of the casing, the turbine-piston shell partitioning an interior volume of the hydrokinetic torque coupling device into a torus chamber and a damper chamber; characterized in that it further comprises a restricting washer disposed between the impeller shell and the turbine-piston shell for restricting hydraulic fluid flow into and from the torus chamber for increasing a hydraulic fluid pressure in the torus chamber and urging the turbine-piston shell toward the first engagement surface (29 1) of the reaction plate (28 2), wherein the restricting washer comprises an annular restrictor plate extending radially outwardly between the impeller shell and the turbine-piston flange of the turbine-piston shell, wherein the restricting washer has at least one pin axially extending from a rear surface of the annular restrictor plate toward the impeller and engaging complementary holes in impeller shell. a casing rotatable about a rotational axis, the casing comprising a casing shell and an impeller shell disposed axially opposite to the casing shell; a piston engagement member non-rotatably coupled to the casing and including an annular reaction plate (28 2) extending radially inwardly from the casing, the reaction plate (28 2) having a first engagement surface (29 1); an impeller coaxial with the rotational axis and comprising the impeller shell; a turbine-piston coaxial with and axially moveable along the rotational axis and hydro-dynamically drivable by the impeller, the turbine-piston comprising a turbine-piston shell including a turbine-piston flange having a second engagement surface (39 2) movable axially toward and away from the first engagement surface (29 1) of the piston engagement member to position the hydrokinetic torque coupling device respectively into and out of a lockup mode in which the turbine-piston is mechanically locked with the casing so as to be non-rotatable relative to the piston engagement portion of the casing, the turbine-piston shell partitioning an interior volume of the hydrokinetic torque coupling device into a torus chamber and a damper chamber; characterized in that it further comprises a restricting washer disposed between the impeller shell and the turbine-piston shell for restricting hydraulic fluid flow into and from the torus chamber for increasing a hydraulic fluid pressure in the torus chamber and urging the turbine-piston shell toward the first engagement surface (29 1) of the reaction plate (28 2), wherein the restricting washer comprises an annular restrictor plate extending radially outwardly between the impeller shell and the turbine-piston flange of the turbine-piston shell, wherein the restricting washer has at least one pin axially extending from a rear surface of the annular restrictor plate toward the impeller and engaging complementary holes in impeller shell.