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 Pressure 600 PSI CWP Handle Pressure 600 PSI CWP Handle Type Lever Stem Type Blowout Proof Body Style Inline Item Ball Valve Compliance MSS SP 110 Body Material Bronze Standards ARRA Compliant 18mm Tether Capable Standard Tool (Accessory Needed for Tethering) Wrench Product Grouping Wrench Sets Material Alloy Steel Corrosion Resistant Yes Handle Type One Piece Opening Type Rounded Number of Tools 18 Head Offset Angle 15 Degrees Head Type Offset Head Thickness 0 000 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 Seat Material Metal