Appleton GRT125-A, 1-1/4″ Hub, Aluminum, Explosionproof Conduit Outlet Box, 1 pc. Appleton GRT100-A, 1″ Hub, Aluminum, Explosionproof Conduit Outlet Box, 1 pc. We have new products in manufacturer boxes, as well as loose and shelf-worn quality products to save you even more money.