The VK971 Quick Response Concealed Sprinkler and Flexible Hose Assembly is a next-generation flexible assembly pre-calibrated with a K-factor of 5.6 (80.6 metric), ensuring accurate system design without the need to calculate friction loss through the flexible hose—an essential benefit in retrofit projects where original system data may be lacking. Available with a brass or ENT finish, 155 °F (68 °C), 175 °F (79 °C), or 200 °F (93 °C) temperature ratings and 48 inch or 60 inch hose assembly lengths.