Steel City 3 GC 3-Gang Outlet Box Cover, Galvanized Steel, 13.5 in³

The 3 GC measures 8-13/16 inches by 4-11/16 inches, which is the standard 3-gang masonry/gang box cover footprint. Match those dimensions against your box flange before ordering, since a 2-gang or 4-gang cover will not line up with the device openings or the mounting screw holes.

Yes. The 3 GC is rated at 13.5 cubic inches, so that volume can be added to the box volume when you work out conductor fill. That matters on a crowded 3-gang where the box alone is short of what the wire count needs.

Both are galvanized steel flat gang box covers, so they serve the same role of closing a ganged outlet box. The Steel City 3 GC is a 3-gang cover measuring 8-13/16 inches long by 4-11/16 inches wide with a 13.5 cubic inch volume, pre-galvanized steel, carrying UL E2969 and supplied with no knockouts. The Mulberry 10093 is from the 1009 Series of galvanized steel flat gang box cover plates. Match the gang count and the overall length and width to the box you are covering before swapping one for the other.

No knockouts. The 3 GC has zero, so it is a solid steel cover for closing out a 3-gang box, not a point for bringing conduit in. If you need a raceway entry at the cover, you need a different part.

The 3 GC is pre-galvanized steel, so the zinc coating is on the material before forming and gives better corrosion resistance than bare steel in unfinished, damp, or unconditioned spaces. It is not a weatherproof cover, so direct exposure to rain or washdown calls for a gasketed weatherproof assembly instead.

The Mulberry 10093, from the 1009 Series, is another galvanized steel flat gang box cover plate. The Steel City 3 GC is the one to stay with when you need the 13.5 cubic inch volume credit and the 8-13/16 by 4-11/16 inch 3-gang footprint confirmed on paper.

No. The Steel City 3 GC is supplied with zero knockouts, so it is a blank flat cover intended to close the box rather than pass a fitting or fixture wire through it. If the opening needs a penetration, choose a cover prepped with the knockout or center hole you need. Within the galvanized steel flat gang cover family, the Mulberry 10093 of the 1009 Series is the comparable flat plate; confirm the prep on any candidate against what your fixture or raceway entry requires.

Sold each. One 3 GC cover per unit, so order one per box when you are covering a run of 3-gang boxes.

Country of origin is the United States. That answers the domestic-content question on government and institutional purchase orders where origin has to be documented.