What are these?

[gtblum]

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[RobC]

Two thermistor housings, either for a boiler, equipment that requires exterior temperature input or possibly for an outside temperature display at the thermostat.

Not sure why they'd use two, there is plenty of room to accommodate more than one sensor.

Did the home have a boiler?

Next time you see one, unscrew the center screw cover and have a look inside.

[gtblum]

Thanks Rob,

I see it now in the other thread I posted today.