Watts 0121491 Relief Valve Refrigerant Extended Probe: The 4-inch thermal

Extended Probe: The 4-inch thermal element delivers responsive temperature sensing for rapid relief during thermal expansion cycles

Versatile Refrigerant Compatibility: Optimized for R22/R407C systems

and high-power fan motors

Automatic Condensate Management: The internal automatic drain ensures consistent liquid removal without the risk of manual oversight or system flooding

making it the correct choice for specialized HVAC pneumatic controls where external temperature sensing is either handled separately or not required at the cover interface

Watts 0121491 Relief Valve Refrigerant Extended Probe: The 4-inch thermalFor contractors servicing high capacity hydronic systems, the Watts 0121491 (LF174A 60) is the industry standard replacement for discontinued models like 0275114 and the original 174A 1 60. This 1" NPT boiler pressure relief valve is specifically engineered for hot water heating and domestic supply boilers, providing emergency relief when system pressure exceeds 60 PSI. Built with a lead free copper silicon alloy body, it features a non metallic disc