When standard vent lengths are insufficient due to structural depth

Key Benefits for Technicians: Factory-Integrated Suppressor: Absorbs voltage transients to prevent damage to expensive solid-state control boards

01 be replaced

the insulator has likely failed and the assembly must be replaced

While newer D and E models serve similar purposes in damper control

Armstrong Fluid Technology 216942-300 Valve 319825-402 When standard vent lengths areThe 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