Rugged steel enclosure with welded seams, gasketed cover and powder coated finish, rated NEMA‑4/IP‑65 for harsh environments. TE‑704‑D has all other features including a fast response brass contact sensor, conduit opening similar to the TE‑704‑C series except designed for applications in unconditioned environments where the unit may be subjected to dirt, condensation, oil vapor and other contaminants.