50820: Mounted by four holes on 5-1/2'' diameter circle Contains 8 color coded terminal posts 50401 - Contains 50801 junction box, 50816 junction box cap, 50820 terminal block, four 50830 filler plugs and mounting and assembly screws 50830 - Fill pre-tapped holes in junction box when compression fittings are not used Includes ''O'' ring for a weather proof seal 50400/50060 - Contains 50800 junction box, 50816/50812 junction box cap, 50820 terminal block, four 50830 filler plugs and mounting and assembly screws 50850 - Kit contains 50820 terminal block, four 50830 filler plugs, assembly and mounting screws. Contains 8 pre-tapped holes to accept compression fittings or filler plugs Made of high impact, chemical resistant plastic 50800 and 50801: 50801 requires a 4-7/8'' clearance hole 50816 and 97933: Made of approved insulating plastic