Control Devices ST Series Brass ASME Safety Valve, 150 psi Set Pressure, 1/4" Male NPT Relief pressure preset to 150 psi with flow rate of 136 cfm 1/4" male NPT threaded inlet connection Brass construction and stainless steel spring for corrosion resistance 250 degrees F maximum temperature for use in high temperature applications ASME safety rated with UV and NB marks