US Patent 7096516 Alarming plumbing screen

A plumbing screen is provided having an annular seal that is adapted to fittingly conform to the internal surface of a toilet drain. The annular seal circumscribes a central screen that provides free fluid communication down the toilet drain but provides physical impingement for obstructions. At least one contact switch is located in the outer seal wall and controls an annunciator module that will provide an audible alarm upon removing the contact between the switch and the toilet sidewall. This audible alarm will indicate tampering with or removal of the screen.