because this is a hard shutoff thermal expansion valve

always ensure the system is flushed and that only compatible polyester oil is used to maintain lubricant integrity with HFC refrigerants

The Honeywell VP519C1006 Air Valve is a 1/2-inch

the insulator has likely failed and the assembly must be replaced

Armstrong Fluid Technology 216942-300 Valve 319825-402 because this is a hardThe 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