Lochinvar & A.O. Smith 100288430 Switch 321702 401 This American made HVAC compressor provides This American made HVAC compressor provides consistent performance in high load environments without the need for additional start components under most system conditions Always verify the set point on your existing switch matches this HVAC pressure sensor to ensure proper inducer motor coordination and burner safety Please contact our team to confirm compatibility or technical details before purchasing verify the pressure switch hose for cracks or moisture and ensure the vent termination is clear of obstructions before replacing this component