Explosionproof Junction Box, Hub Size 3 Inch, Overall Size 12 Inch L x 12 Inch W x 8.75 Inch D, Inner Size 10.63 Inch W x 5.25 Inch D x 10.63 Inch H, Wall Thickness 0.69 Inch (Side/Bottom), Cover Type Threaded, Cover Opening Diameter 9.88 Inch, Enclosure Class I Div 1 and 2 Group B C D Class II, Div 1 and 2 Groups E F G, Class III NEMA 4/4X/7BCD/9EFG, Body Material Copper-Free Aluminum, Body Finish Gray Epoxy Powder Coated, Cover Material Copper-Free Aluminum, Cover Finish Gray Epoxy Powder Coated, Mounting Feet, Approval UL 886, CUL, CSA C22.2, Application Hazardous Location, Material Neoprene (O-Ring)