a position detector for a check valve , including a bracket with a support arm , adjustable securing members adapted to rigidly secure the bracket to a check valve arm , a tilt switch , a connector , a circuit status indicator , a wire connector for both the tilt switch and the circuit status indicator , and a first plug . the connector adjustably connects the tilt switch to the bracket support arm in a selected one of a plurality of secure positions pivoted around an axis fixed to the bracket support arm , the axis being oriented generally horizontally when the securing members secure the bracket to the check valve arm . the first plug is selectively securable to the wire connector whereby a first circuit with the tilt switch and the circuit status indicator is formed when the tilt switch is in a selected position .