Control Devices ST Series Brass ASME Safety Valve 1/4" NPT 165 PSI 64 SCFM Relief pressure preset to 165 psi with flow rate of 64 SCFM 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