Pendent & Upright Sprinkler LF311, LF321, LF310 & LF320,? Glass bulb ? K-factor 5.6 ? Quick & Standard Response ? Available Temp Rating : 135°F/ 155°F/ 175°F/ 200°F / 286°F (57°C/ 68°C / 79°C/ 93°C/ 141°C ) ? 1 ? 2” NPT Thread Size