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Viking Mirage standard (small) diameter fire sprinkler cover plate for Mirage concealed pendent fire sprinklers. Like a fire sprinkler, the Viking Mirage cover plate is heat sensitive. When it reaches 135 degrees Fahrenheit, the temperature-sensitive solder holding the decorative exterior of the cover plate to its frame melts and the two separate. The temperature of the cover plate should be at a minimum 20° F cooler than the sprinkler head itself to give the sprinkler time and freedom of motion to activate. This Viking Mirage cover fits ONLY the following Viking concealed sprinkler models: VK457, VK4570, VK474, VK4740, VK488, VK4880, VK494, VK4940, VK461, VK462, VK463, VK464, VK465, VK492, VK632, VK634