B-Line Eaton series wiring trough, 4" height, 12" length, 4" width, GTGV NK wiring trough, Thru holes, No knockouts, Screw cover, 3R, Galvanized stee

The 4412 GTGV NK is a NEMA 3R enclosure, so it is built for outdoor use where falling rain, sleet and external ice formation are the concern. The body is galvanized steel in gray, 16 gauge, and the screw cover uses plated screws. NEMA 3R is not a washdown or hosedown rating, so keep it out of locations subject to direct pressure spray or submersion.

One section of the 4412 GTGV NK measures 4 inches high by 4 inches wide with a 12 inch length, and weighs 4.134 lb. That 4 x 4 cross section is the standard small gutter size electricians use for splice and pull points at panel boards; the 12 inch length is a short section, so longer runs are made by coupling multiple bodies end to end.

No. The NK in 4412 GTGV NK means no knockouts, so every conduit entry has to be field punched with a hole saw or knockout punch to suit your fittings. That is the right choice when you want to place entries exactly where the raceway lands, but it does add hole-cutting labor compared with a pre-punched gutter. Deburr and use rain-tight fittings on any entry in a wet location.

The cover is a screw cover held by plated screws, so the whole cover lifts away for wire pulling and splicing once the screws are out. Mounting is through holes in the back of the body, meaning you fasten it directly to the wall, strut or backboard with your own fasteners. No mounting hardware is described as included, so plan on supplying screws, anchors or strut nuts for the substrate you are landing on.

Galvanized steel with a screw cover, like the 4412 GTGV NK, suits outdoor and damp locations and installs where the cover stays closed most of its life: feeder splices, tap points above a panel, exterior wall runs. A screw cover is slower to open than a hinged cover, so if you expect to get into the gutter regularly for troubleshooting or terminations, a hinged-cover gutter saves time. Painted or powder coated steel gutters are for dry indoor use; this one is galvanized and rated NEMA 3R for weather exposure.

At 16 gauge, the 4412 body is in the normal range for small wireway and gutter bodies and will carry the cable weight in a 4 x 4 run without oil-canning. The galvanized finish is what gives it corrosion resistance outdoors, which is why it pairs with the NEMA 3R rating; the cover screws are plated for the same reason. Field-cut conduit entries expose bare steel at the edge, so touching up cut holes is worth the two minutes on an exterior installation.

The finish color on the 4412 GTGV NK is gray over galvanized steel, which is the standard color for B-Line series wiring troughs, so it lines up visually with existing gray 4 x 4 gutter on the same wall. Matching the cross section matters more than color for a continuous run: confirm the existing sections are also 4 inch by 4 inch before coupling to them.