Use a manometer to confirm the system is pulling at least

If you need the springs or hard plastic modules

the 7836178 is the current manufacturer-recommended OEM replacement for the older 7826520 part number

Enhances System Efficiency: Promotes full utilization of evaporator coil surface area for maximum heat exchange

This part is a direct replacement for legacy part numbers such as 704366

Velocity Boiler Works (Crown) 450601 Low Water Cut-Off 321702-401 Use a manometer to confirmThe Velocity Boiler Works (Crown) 450601 Low Water Cut Off is a mission critical safety component designed for residential hot water boilers. Engineered for 24VAC systems, this LWCO primary control utilizes advanced probe style sensing to monitor the boilers fluid levels without the need for mechanical floats. With a 3 4 inch NPT process connection and automatic reset logic, it ensures the burner circuit is de energized immediately if water levels