The device according to the invention comprises a water tank (1) and a drain line (2) and the drain line (2) is provided with a pressure relief device (3) made of a horizontal pipe (7) and a control (10) with a vertical barrier (8) wherein the tube (7) is pivotally mounted about a horizontal axis and the vertical bar (8) is formed by up and down sections of the tube (7) and their connecting portions (11, 12, 13). HE
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