OVERFLOW PREVENTER; COMPRISES A PLUG HAVING A VALVE MOVABLE BETWEEN A CLOSED AND AN OPEN POSITION, THE VALVE BEING BIASED TO THE CLOSE POSITION IN NON-OVERFLOW SITUATIONS

摘要

An overflow preventer comprising a plug receivable in a drain hole and provided with a valve movable between a first closed position and a second open position, the valve being resiliently biased to the first position while the pressure on the valve is less than a predetermined value.