WWF274428 (Watts) | 3/4 LF174A 30 FS | Relief Valves | 3/4 x 3/4This Pressure Relief Valve Has a 3 4 Inch Nptf Female Inlet And Outlet And a 30 psi Pressure Relief Setpoint. The Valve Can be Used For Hot Water Space Heating Boiler Applications to Protect Against Excessive Pressure. It Features a Bronze 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 From The Relief Valve.