Covers equipment for a plumbing fixture, such as a wash basin, lavatory, etc., employing a photo-conductive cell structure mounted within a view tube pointed in the direction of the user of the plumbing fixture. The photo cell structure will recognize or respond to the presence or absence of a user in the vicinity of the plumbing fixture. The cell may act as a trigger or switch to initiate the operation of the plumbing fixture to transmit water therethrough and then control apparatus to shut off the flow of water to the plumbing fixture after the user has removed his hands from the wash basin or has removed himself from the view of the photo cell structure.