This part number refers to the heat exchanger assembly itself

Durable Construction: High-quality forged brass or bronze body ensures integrity under high static pressures

While some Sporlan valves can be adapted for alternatives like R-422D

the sensing element is fully replaceable

Bray Commercial GASRE24-450 Actuator 322057-301 This part number refers toThe Bray Commercial GASRE24 450 Actuator is a high torque 24V NEMA 1 modulating spring return actuator engineered for precise control of HVAC damper applications and valve assemblies. Delivering 450 lb in of torque, this unit is designed for proportional control, utilizing a 2 10 VDC or 4 20 mA input signal to maintain exact positioning in demanding air handling systems. The spring return safety function ensures a reliable fail safe position upon loss