Leaking auto pool filler line part identify

It looks like the black part might be a flood sensor.



 
Thanks! That sure looks like it. The valve is pretty new, the pool was built last year. Would I have to take the whole valve out to rebuild it?
Also, it may have been damaged during a freeze last winter. I probably need to see if the actual brass valve is cracked or just this sensor.
Do you know if the sensor just unscrews out of the brass valve?
 
Thanks! That sure looks like it. The valve is pretty new, the pool was built last year. Would I have to take the whole valve out to rebuild it?
Also, it may have been damaged during a freeze last winter. I probably need to see if the actual brass valve is cracked or just this sensor.
Do you know if the sensor just unscrews out of the brass valve?
 
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