WWF383793 (Watts) | 1 1/2 740 055 FS | Relief Valves | 1-1/2 x 2This Pressure Relief Valve Has a 1 1 2 Inch Nptf Female Inlet, 1 1 4 Inch Nptf Female Outlet, And Pressure Relief Setpoint of 55 Psi. The Valve Can be Used For Hot Water Space Heating Boiler Applications to Protect Against Excessive Pressure. It Features an Iron Body, Non Metallic Disc To Metal Seating, And Test Lever. Includes a Nonrestrictive Discharge Drain Line Flood Sensor With Sentryplus Alert(R) Technology to Detect Excessive Water Discharges