According to the present invention, water regulation assemblies disposed in the water supply path of conventional fixtures are modified to include a pressure relief assembly which permits release of water under elevated pressures. A normal shut-off seal included in the water regulation assembly may be modified to release water in response to elevated pressure even when the seal is placed in a shut-off position. In particular, mating components included in the seal assembly are modified to separate at the elevated pressure. The seal may also be by- passed by a pressure relief water path which opens in response to elevated pressures. These features permit relief of elevated pressure in water supply lines which might otherwise produce a burst event within the water supply lines. In sliding plate type faucets where a seal is created by pressing of two plates together, pressure relief according to the present invention is obtained by permitting separation of the plates under elevated pressure. A compressible member allows the fixed plate to separate from the sliding plate.
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