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 3KD38 Inside Width 2 in Inside Width 2 in Wine Glasses VOC Content Weight Percentage 0% Product Form Liquid Compatible Material Aluminum 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 Body Material Iron