Sprinkler design incorporates state-of-the-art heat responsive frangible glass bulb design (standard or quick response) for prompt precise operation. Key Points: K Factor : 5.6 Nominal Thread Size : 1/2" NPT Working Pressure : 175 PSI Data Sheets: Upright Sprinklers Pendent and Recessed Pendent Sprinklers Concealed Pendent Sprinklers Horizontal Sidewall Sprinklers Vertical Sidewall Sprinklers Conventional Sprinklers