Watts 374A-3/4 Boiler Pressure Relief Valve

Watts 374A-3/4 Boiler Pressure Relief Valve is a trusted safety device for hot water space heating boilers. The lever-type design pairs a durable iron body with a forged brass inlet and a 3/4 inch outlet to deliver reliable overpressure protection in residential and commercial systems.

Set to relieve at 30 PSI with a broad operating range from 30 to 150 PSI, it guards against dangerous pressure buildup while supporting consistent boiler performance.

• Inlet/Outlet: 3/4 inch inlet, 3/4 inch outlet; end connection: female threaded x female threaded
• Materials: Iron body; forged brass inlet; stainless steel spring; metal seat; non-metallic disc
• Pressure: Set pressure 30 PSI; operating range 30–150 PSI
• Application: Hot water space heating boiler
• Standards: ASME, NB, HV, MIL-V-18634B; Type I, Class 3A, Style B
• Capacity: 550,000 BTU/Hour
• Dimensions: 3-5/8" L x 2-1/2" W
• Special features: Seat located above drain

Designed for dependable performance in ASME-compliant installations, this valve combines a metal seat with a non-metallic disc and a stainless steel spring to ensure long-lasting protection for hot water boiler systems.