To an oldtimer, a Bell Box or Bell Cover refers to any one, two or three gang weatherproof die cast aluminum box, extension or cover. BELL, founded in 1946 by Frank BELLeck and Harry Stllman, was the first to market weatherproof boxes and covers. It became part of SquareD in 1971 and then in 1986, part of the Hubbell RACO family. The boxes and extensions have anywhere from three to five threaded hubs ranging from 1/2 to 1". Covers are available for almost any combination of devices you can imagine.