Watts f121504 Lead Free Relief Valve 125 Psi 1 Inch Nptf

Product Description

The WATTS f121504 is a lead free pressure relief valve designed to protect hot water space heating boilers from excessive pressure buildup. Built on the LF174A series platform, it features a lead free copper silicon alloy body with a 1 inch NPTF female threaded inlet and outlet, a 125 psi pressure relief setpoint, and a non-metallic disc-to-metal seating arrangement for reliable shutoff. The valve includes a nonrestrictive discharge drain line flood sensor with SentryPlus Alert technology that detects excessive water discharges from the relief valve, enabling early warning before a problem escalates. Licensed plumbers and hydronic heating technicians are the typical installers for this component.

This relief valve is suited for residential and light commercial hot water space heating boiler systems where lead free compliance and pressure protection are required. The integrated flood sensor connectivity allows the valve to interface with existing building management systems or the Watts Cellular Gateway when paired with a separately purchased activation kit. It is a direct-fit solution for boiler installations requiring a 1 inch NPTF threaded relief valve with smart monitoring capability.

Key Features

• Lead free copper silicon alloy body meets lead free installation requirements
• 125 psi pressure relief setpoint protects boiler systems from overpressure
• 1 inch NPTF female threaded inlet and outlet for standard pipe connections
• Non-metallic disc-to-metal seating provides reliable sealing performance
• Test lever allows field verification of valve operation without system shutdown
• SentryPlus Alert flood sensor detects excessive discharge and supports BMS or cellular gateway integration

Compatibility

Designed for hot water space heating boiler applications requiring a 1 inch NPTF female threaded pressure relief valve with a 125 psi relief setpoint. Flood sensor activation requires a separately purchased Watts activation kit, compatible with existing building management systems or the Watts Cellular Gateway.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and the applicable provisions of the International Plumbing Code (IPC). Shut down the boiler and relieve system pressure before removing or installing any relief valve. Do not plug, cap, or restrict the discharge outlet at any time. Connect the discharge line to an appropriate drain location per code requirements before placing the system back in service.

Technical Specifications

• Series: LF174A
• Pressure Relief Setting: 125 psi
• Maximum Working Pressure: 93 psi
• Inlet Connection Size: 1 inch
• Inlet Connection Type: Female Threaded
• Inlet Thread Type: NPTF
• Outlet Connection Size: 1 inch
• Outlet Connection Type: Female Threaded
• Outlet Thread Type: NPTF
• Body Material: Lead Free Copper Silicon Alloy
• Lead Free: Yes
• Weight: 30.60 pounds

Standard Information

• Brand: WATTS
• Manufacturer Part Number: f121504