Abstract: In accordance with the principles of the invention, an automatic shut-off valve is provided for use with a fluid utilization device. The valve automatically cuts off water to the utilization device should the utilization device develop a leak. In an illustrative embodiment of the invention, the valve includes a valve assembly having a valve body, an inlet port, an outlet port, and a valve member movable between first and second positions, and an element biasing the valve member to the second position. An actuator is coupled to the valve. The actuator comprises a fluid responsive member coupled to the element to maintain the valve member in the first position in the absence of fluid. The fluid responsive member becomes weakened in the presence of the fluid such that the fluid responsive member is severed thereby releasing the actuator such that the valve member automatically moves to the second position.