the AFS-405 air pressure switch provides the versatility required for complex air-handling unit (AHU) configurations where consistent air flow proving is mandatory for system safety and performance

Flexible Mounting: The industrial gas pressure switch design allows horizontal mounting

it is built to withstand the high-temperature environments of a boiler cabinet while maintaining tight switching tolerances

Using it in non-compatible ballasts may result in incorrect voltage draw or electrical failure

Broad Compatibility: Fully compliant with ASME B16

Honeywell 313744A Replacement Assembly 30067439-890 the AFS-405 air pressure switchWhen you're dealing with a failing Honeywell VP519 series valve, the Honeywell 313744A Replacement Assembly is the direct OEM solution required to restore precise fluid control without replacing the entire valve body. As a pneumatic actuator designated for "used with VP519 series valves," this assembly ensures a seamless mechanical interface and maintains the original flow characteristics of your hydronic or steam system. This replacement actuator is