Red Dot ALR-6 2 INCH RIGID LR CONDUIT BODY

It threads onto 2 inch rigid or IMC conduit, which is what the ALR-6 is built for. EMT is not threaded, so this body will not accept it directly. For an EMT run you either use set-screw or compression type conduit bodies sized for EMT, or transition to threaded rigid with an EMT-to-threaded coupling and then land the ALR-6.

If what is coming off is a 2 inch LR body on threaded rigid or IMC, yes, the ALR-6 lands in the same place. Confirm two things before you pull the old one: that the branch opening on the existing body faces right relative to the cover (that is what makes it an LR rather than an LL), and that the conduit is threaded rather than EMT. Different letter designation means a different opening orientation and the conduit will not line up.

Die cast aluminum. That matters on two counts: it is light enough to hang on a 2 inch run without extra support in most cases, and it keeps the metallic equipment grounding path continuous through threaded rigid/IMC connections. Aluminum also holds up outdoors better than ferrous bodies, though it should not be buried in direct contact with concrete or in corrosive soil.

Series A conduit bodies like the ALR-6 use a separate cover plate, and the cover and gasket are typically ordered as their own items for the body size. Plan on a 2 inch Series A cover plus a gasket if the location is wet or damp. Match the cover to the same Series A pattern so the screw holes and opening line up.

Yes, aluminum bodies are routinely threaded onto galvanized rigid steel in dry interior and typical exterior work, and the ALR-6 is die cast aluminum. Where you want to avoid it is a persistently wet or chemically aggressive location, where dissimilar metal contact can corrode the joint. In those spots use a body of the same material as the raceway, or treat the threads with an approved compound.

Treat it as a pull and routing point, not a junction box, unless the body is marked with a cubic inch volume. Conduit bodies without a marked volume are not permitted to contain splices or taps, which is why they exist to let you pull wire around a turn and then close it up. If you need to splice on that 2 inch run, use a properly sized pull or junction box instead.

Order it as Red Dot ALR-6. That is the 2 inch LR Series A body for rigid and IMC conduit in die cast aluminum. The 6 in the catalog number is Red Dot's trade size code, not a dimension, so do not read it as a size.