B-Line Eaton series wireway telescoping fitting, Feed through, Wireway telescoping fitting, 12, Steel, Brushed finish, 4" X 4"

A telescoping fitting closes a gap in a wireway run when the two sections cannot be pulled together or when a length has to be removed later without disturbing the rest of the run. The Eaton B-Line 44-12FT is the feed-through version, sized for 4 inch by 4 inch wireway, so conductors pass straight through with no pull point or direction change. It is the piece you order when a field-measured gap does not land on a standard stick length.

Yes. The 44-12FT is a NEMA 12 fitting, so it belongs on indoor, dust-tight, drip-tight wireway, not on outdoor or washdown runs. It is also UL Listed. Mixing a NEMA 12 fitting into a NEMA 3R run breaks the enclosure rating of the whole assembly, so keep the fitting class matched to the wireway class.

The fitting measures 15.5 inches in length, with a 3.82 by 3.82 inch cross section to suit 4 by 4 wireway. Because it telescopes, it is set somewhere short of that full 15.5 inches once it laps into the adjoining sections, so measure your actual open gap against the fitting's collapsed and extended positions before cutting a run.

No. The 44-12FT is built for 4 inch by 4 inch wireway, with a 3.82 by 3.82 inch body. On a 6x6 or 8x8 run you need the telescoping fitting sized to that cross section instead. Trying to adapt across sizes leaves an open seam and voids the dust-tight NEMA 12 rating.

No. The 44-12FT is a feed-through fitting, meaning conductors pass straight through it. If you need a place to pull, splice, or change direction, specify a pull box, elbow, or tee fitting for the 4x4 wireway instead and use the telescoping piece only to close a length gap.

Steel, with a brushed finish. That suits it to indoor industrial and machine-room runs where the wireway is painted or unfinished steel already. For corrosive or wet-location work, steel with a brushed finish is not the right specification.

It weighs 6.549 lb, so a single installer can hold it in place on an overhead run while starting the fasteners. No lifting help or temporary support is needed for the fitting itself.