WWF121539 (Watts) | 1 1/2 LF174A 75 FS | Relief Valves | 1-1/2 x 1-1/2This Lead Free Pressure Relief Valve Has a 1 1 2 Inch Nptf Female Inlet And Outlet And a 75 psi Pressure Relief Setpoint. This Valve Can be Used For Hot Water Space Heating Boiler Applications to Protect Against Excessive Pressure. It Features a Lead Free Copper Silicon Alloy 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