Definition of boxes

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Well I found this old yellowed book of mine. Tom Henry...my first instructor from "1980 sumpin"..FD boxes as we know are malleable iron, aluminum for use with RMC or IMC with theaded entries and are called Fitting Deep or FItting Shallow.......ie. FD and FS
 
My guess, with absolutely nothing to back it up, (never stopped me before ) is Fitting Deep and Fitting Shallow, because most of them already have threaded hubs built in.
 
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