pressure relief valve, size 1/4, 3/8, 1/2 and 3/4 BSP/ISO228/NPT threaded connection PN16, 200PSI Working Temp 0-120C Automatic air pressure relief valveBrass forged for HVAC systemmax working pressure 1.6MPa (200PSI)Max working temperature 120Cheating, floor heating and air conditioner systemMS58 brass body, brass releaserPP floater