Product Type: Alarm Check Valve Brand: Any Origin: China System: Wet-Pipe Automatic Sprinkler Nominal Size: 150 & 100 NB Working Pressure: 175 PSI Pressure Range: 21 PSI TO 250 PSI Testing Pressure: 350 PSI Material: Cast or Ductile Iron Connections: Flanged / Grooved Installation: Vertical Certification: UL / FM Options