Control Devices NC Series Brass Non-Code Safety Valve, 25-200 psi Adjustable Pressure Range, 1/4" Male NPT Relief pressure adjustable from 25 to 200 psi 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 Silicon O-ring provides leak-proof seal to within 10 percent of set pressure