Armstrong Fluid Technology 216942-300 Valve 321042-401 Environmentally Hardened: NEMA 4X watertight

Environmentally Hardened: NEMA 4X watertight enclosure and aluminum construction prevent corrosion in demanding mechanical rooms

This high-spec condenser fan blade is critical for ensuring consistent airflow across the condenser coils

The 01CT-5LH utilizes a specific NTC10k Pre element

Simplified Programming: Captive trippers eliminate the risk of lost parts and allow for rapid 15-minute scheduling increments

Armstrong Fluid Technology 216942-300 Valve 321042-401 Environmentally Hardened: NEMA 4X watertightThe Armstrong Fluid Technology 216942 300 Valve is a precision engineered 1 2" NPT Brass Hot Water Pressure Relief Valve designed for high performance hydronic heating systems. Factory set at a 30 PSI relief pressure, this RL 11 relief valve serves as a critical safety component by automatically discharging excess pressure to protect boilers and downstream piping from structural damage. Constructed from high grade, corrosion resistant brass, it