Explosionproof Junction Box, Hub Size 4 Inch, Overall Size 13.62 Inch L x 13.62 Inch W x 15.75 Inch D, Inner Size 12.13 Inch W x 12 Inch D x 12.13 Inch H, Wall Thickness 0.75 Inch (Side), 0.69 Inch (Bottom), Cover Type Threaded, Cover Opening Diameter 11.25 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)