This is an Appleton GRSS75 3/4" Explosion Proof Junction Box.  7 hub box, comes with 4 plugs.  It is new in the box. Copper-Free Aluminum.  It is equal to Killark GRSS-2.

 I also have most other sizes in my store.  Check my feedback and buy with confidence.  We have been in business for 20+ years.  As with all my listings, your satisfaction is guaranteed.  I can ship same day ups if the order is received before 3:00 pm central.  Check my store for more fittings or contact me for items not listed.