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Manufacturer Resources
Product Specs
- Country Of Origin:
- Mexico (MX)
- Product Group:
- Electrical Boxes
- Product Type:
- Device Boxes, Covers & Accessories
- Product type2:
- Electrical box covers
- Selling Unit Of Measure:
- each
- Standards:
- UL E28688
- Department:
- Electrical
- Product Subgroup:
- Outlet Boxes
- Product Color:
- Silver
- Product Material:
- Aluminum Die Cast
Red Dot SJ-21 – Frequently Asked Questions
1) What is the Red Dot SJ-21 actually for?
The SJ-21 is a blank jumbo cover for a 4-1/2 inch round weatherproof outlet box, with two hubs. Blank means no device opening, so it closes off the box while the two hubs take conduit entries. It is sold individually.
2) Is the Red Dot SJ-21 UL listed?
Yes. It carries UL file E28688. If your inspector or spec requires listed components for the enclosure assembly, that file number is what to reference on the submittal.
3) Is the SJ-21 cover corrosion resistant enough for outdoor use?
It is die cast aluminum, which is the usual material for exterior weatherproof covers and does not rust the way steel does. Finish is a silver aluminum appearance, so it matches other Red Dot die cast boxes and covers on the same run.
4) Why would I use a blank cover with two hubs instead of a plain blank cover?
The two hubs let conduit enter through the cover itself rather than through the box walls, which is how you feed a through run or pick up a branch when the box side knockouts are already used or inaccessible. If you need no conduit entries at the cover, use a plain blank cover instead; if you need to mount a receptacle or switch, you need a device cover, not the SJ-21, because it has no device opening.
5) Can I use the SJ-21 to blank off an unused outdoor box on a building exterior?
That works, with one caveat: the SJ-21 has two hubs, so any hub you are not using has to be closed with a plug or a fitting to keep the enclosure sealed. If you simply want a dead cover with no openings at all, order a blank cover without hubs for that opening.
6) What is the manufacturer part number and country of origin for this Red Dot jumbo cover?
Part number is SJ-21 from Red Dot, made in Mexico. That MPN is what to quote for a 4-1/2 inch round two hub blank jumbo cover.
How fast can I get the Red Dot SJ-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 Red Dot SJ-21 come with a warranty?
Absolutely. The Red Dot SJ-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 Red Dot SJ-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 Red Dot SJ-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.