Raypak 155B/155C Cast Iron Return Header (004964F) heaterparts Pressure switches are critical because

Pressure switches are critical because they help the system respond appropriately to operating conditions before power is applied to connected components

Raypak 155A heat exchanger gasket set

or related equipment model information

or no longer responds correctly to low temperatures

That helps restore the intended control logic without broader system redesign

Raypak 155B/155C Cast Iron Return Header (004964F) heaterparts Pressure switches are critical becauseThe Raypak cast iron return header is designed for compatible 155B and 155C heater applications where the supported return side header needs replacement. A return header is useful because it helps route water through the heater while also serving as one of the major structural and sealing sections of the assembly. This replacement is especially useful when the original header is cracked, corroded, or leaking. Matching the correct cast iron return