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watts 530C 3/4" calibrated pressure relief valve

This is a NIB Watts Series 530C Calibrated Pressure Relief Valves. They are used in commercial, residential and industrial applications to protect against excessive pressure in systems containing water, oil, or air. It consists of a bronze body construction with NPT threaded male inlet and NPT threaded female (drain) outlet connections, stainless steel spring, brass bonnet, Buna-N disc, and Buna-N O-ring. Series 530C has a calibrated adjustment feature for setting the valve to the required relief pressure, and is ideal for by-pass thermal expansion pressure relief (not ASME approved).
Maximum Pressure: 300psi (20.67 bar)
Adjustable Pressure Ranges: 50 to 175psi (3.45 to 12.06 bar)
Size 3/4 in. - 100 to 300psi (6.89 to 20.67 bar)

 watts 530C 3/4