ot what is this???????????

bought at swap meet have no idea what it is or its purpose

 

I'll venture a guess and say it's some sort of pressure alarm.

 

it is for an automatic fire sprinkler system, senses change in temp rise. For rate of rise systems.........

 

Looks like a "drawer".

 

thanks guys we thought it was some kind of alarm. i knew i could count on the hamb for some answers