especially when servicing units under high thermal stress

Safety Shut-off: High-performance automatic gas shut-off mechanism ensures flow is restricted if the pilot flame is lost

Key Benefits: Fail-Safe Protection: Instantly breaks the burner circuit during low-water events to prevent catastrophic boiler failure

making it an ideal choice for freeze protection and basic climate management in harsh environments

it provides the stable manifold pressure necessary for modern high-efficiency heating equipment

Watts 0121522 Valve 320788-704 especially when servicing units underThe Watts 0121522 is a high capacity LF174A Pressure Relief Valve engineered for heavy duty hot water heating boiler applications. Featuring a 1. 25 inch female NPT inlet and outlet, this ASME Section IV safety valve is factory set at 100 PSI to protect hydronic systems from catastrophic over pressurization. The Lead Free cast copper silicon alloy body ensures compliance with stringent potable water requirements while providing superior corrosion