Type LB Rigid Conduit Body 3-1/2″, Malleable Iron, NPT Threads
https://dev.nsiindustries.com/product/type-lb-rigid-conduit-body-3-1-2-malleable-iron-npt-threads/
Bridgeport Type LB rigid conduit bodies allow access to the interior of a rigid / IMC conduit system for inspection, pulling and maintenance. Conduit bodies are designed for a 90 degree cable pull with the cable exiting through the back of the body.