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Manufacturer Resources
Product Specs
- Country Of Origin:
- United States
- Number Of Knockouts:
- 0
- Selling Unit Of Measure:
- each
- Standards:
- UL E2969
- Surface Finishing:
- Pre-Galvanized
- Volume:
- 15 in³
- Department:
- Electrical
- Product Group:
- Boxes & Enclosures
- Product Subgroup:
- Box Covers
- Product Type2:
- Outlet Box Covers
- Product Size:
- 4-11/16 Inches
- Product Color:
- Silver
- Product Shape:
- Square
- Product Material:
- Steel
- Product Type:
- Box Cover
Steel City 72 C 21 – Frequently Asked Questions
1) What size box does the Steel City 72 C 21 cover fit?
It's a 4-11/16 inch square cover, so it mounts to a 4-11/16 inch square outlet box. It will not fit a 4 inch square box; for those you need a 4 inch square cover instead.
2) Does the Steel City 72 C 21 cover add box volume for conductor fill calculations?
Yes. The 72 C 21 is rated at 15 cubic inches, and that volume adds to the box volume when you work out conductor fill under the NEC box fill rules. Useful when a 4-11/16 square box is tight on fill.
3) Will the 72 C 21 take two devices side by side?
It's a two gang cover, so it accepts two devices (two switches, two receptacles, or one of each) mounted side by side on a 4-11/16 inch square box.
4) Is the Steel City 72 C 21 UL listed?
Yes, it carries UL file E2969.
5) Is this steel cover suitable for a damp or unfinished area like a garage or mechanical room?
The 72 C 21 is pre-galvanized steel, which gives it corrosion resistance for dry and indoor unfinished locations such as garages, mechanical rooms, and warehouse ceilings. It is not a weatherproof or gasketed cover, so for wet locations use a listed weatherproof cover and box.
6) Does the 72 C 21 cover have any knockouts for conduit?
No knockouts. The cover is blank apart from the device openings, so all conduit entries have to come off the box itself.
7) Is the Steel City 72 C 21 sold individually or in a carton?
It's sold each, so you can order the exact count you need for a job rather than a full box.
8) What is the finish and country of origin on the Steel City 72 C 21 box cover?
Silver pre-galvanized steel, made in the United States. The bare galvanized look matches standard steel boxes and raceway in exposed commercial work; if the devices are in a finished space you'd typically add a wall plate over it.
How fast can I get the Steel City 72 C 21 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Steel City 72 C 21 come with a warranty?
Absolutely. The Steel City 72 C 21 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Steel City 72 C 21?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Steel City 72 C 21 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.