Lochinvar & A.O. Smith 100111921 Relief Valve 30067439-890 This primary limit control features

This primary limit control features a factory-calibrated 135-120 temperature range

140X series valves are often compatible with SentryPlus Alert technology when used with a retrofit sensor kit

Designed as a direct HD44AE129 replacement and HD44AE132 replacement

5" WC for natural gas applications to maintain consistent burner flame stability

Durable Construction: Built with high-grade materials to maintain temperature accuracy despite the dust and debris often found in technical HVAC supplies

Lochinvar & A.O. Smith 100111921 Relief Valve 30067439-890 This primary limit control featuresThe Lochinvar and A. O. Smith 100111921 Relief Valve is a critical safety component designed for high efficiency commercial boilers and water heaters. Engineered to meet strict ASME Section IV requirements, this pressure relief valve protects the heat exchanger and plumbing system from over pressurization by opening at its specific factory set PSI. This genuine OEM replacement part replaces older part numbers including 100111921 and RLVAL2409,