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Do me a favor and measure the box from outside to outside-- I bet it is 1 5/8" deep.
Dennis, if you look inside the box, the knockouts are about 1/8" thick, making the box 1-5/8" from the bottom to top measuring from where there is no knockout. I'm guessing they have to use the knockout area as space being used and have to rate the box as 1-1/2" inside useable area.
 
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