Watts 1 1 4 740 030 FS Hot Water Relief Valve, Iron, FNPTF x FNPTF, 1 1 4 in x 1 1 2 in, 30 psi 98381A443 000 hr Fixture Housing Material 000 hr Fixture Housing Material Aluminum Description Special Features Continuous 0 10V Dimming Color Rendering Index 80 Color Temperature 5000K Green Certification or Other Recognition DesignLights Consortium (DLC) Max Minimizing Slippage Spring Material Stainless Steel 000 BtuH Spring Material Stainless Steel Factory Set Pressure 30 psi Operating Pressure Minimum 30 psi For Media Water Inlet Connection Type NPTF ASME Section Code Section XIII Operating Temperature Maximum 250 Degrees F Product Type Pressure Relief Valve Operating Pressure Maximum 75 psi Outlet Connection Type NPTF Inlet Connection Gender Female Outlet Connection Gender Female Operating Temperature Minimum 40 Degrees F Country of Origin United States