Abstract: A leak sensor apparatus (10) and flow control equipment (16) for sensing a leak from a machine using a supply of water (or other fluid) or from connecting hoses supplying the water, and for turning off the supply when a leak is detected, with the leak sensor (10) itself including in particular two conductors (10a–b) held in spaced apart relation in a fluid-permeable insulating material (10c), and the flow control equipment (16) for providing a voltage difference between the two conductors (10a–b) and for sensing the presence of a fluid based on the fluid providing an electrical path between the two conductors (10a–b) and so allowing current to flow between the two conductors (10a–b) under the urging of the voltage difference provided by the flow control equipment (16). In some embodiments, the two conductors (10a–b) are configured so as to wrap about one or more of the connecting hoses.