Viking Mirage® Quick Response Extended Coverage Concealed Pendent Sprinkler VK632 is a thermosensitive glass-bulb spray sprinkler designed for installation on concealed pipe systems where the appearance of a smooth ceiling is desired. The VK632 has a standard brass finish, a K-factor of 5.6, and a 155°F temperature rating. Refer to the technical datasheet for the required design and installation criteria.