Pass & Seymour Thermoplastic R...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1.31
Pass & Seymour Thermoplastic Round Blank Cover

Pass & Seymour Thermoplastic Round Blank Cover

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Model: 4RBC

In Stock (leaves warehouse same day if ordered before 3pm ET)

$1.31
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Pass & Seymour Thermoplastic Round Blank Cover

The Pass & Seymour Round Blank Cover is a flat, device-free plate designed to close off a 4-inch round outlet box cleanly and safely. Molded from durable thermoplastic and finished in gray, this blank cover is UL Listed and ships in a convenient 50-pack, making it a practical solution for electricians and facility maintenance teams who need to cap unused round boxes quickly and reliably.

Key Features

  • Box Compatibility: Sized to fit standard 4-inch round outlet boxes for a clean, flush finish.
  • Durable Construction: Molded thermoplastic material resists cracking and everyday wear, offering long-lasting performance.
  • Flat Blank Design: No device openings, ideal for permanently or temporarily capping an unused round box.
  • Finish: Gray color blends with standard electrical box finishes for a neat appearance.
  • Bulk Packaging: Sold in a 50 EA pack, ideal for contractors and multi-unit projects that need consistent supply on hand.
  • Made in the USA: Manufactured in the United States as part of the Pass & Seymour product line.

Certifications & Compliance

  • UL Listed

Technical Specifications

  • Material: Thermoplastic
  • Product Line: Pass & Seymour
  • Country of Origin: United States
  • Color: Gray
  • Packaging: 50 EA

Typical Applications

  • Capping Unused 4-Inch Round Outlet Boxes
  • Commercial and Residential Electrical Installations
  • Renovation and Remodel Projects
  • New Construction Wiring Rough-In
  • Facility Maintenance and Box Closeouts

Why Pass & Seymour?

Pass & Seymour, a Legrand brand, builds this round blank cover from durable thermoplastic and backs it with a UL Listing, giving electrical professionals a dependable way to safely close out unused round boxes. Manufactured in the United States and packaged 50 to a case, it is a straightforward, code-conscious choice for keeping job sites stocked with reliable, ready-to-install covers.

Manufacturer Resources

Spec Sheet

Product Specs

list_batch:
PASS-20260820
Product Type:
Blank Cover
Listing:
UL Listed
Country Of Origin:
United States
Product Material:
Thermoplastic
Product Color:
Gray
Product Size:
4"
Department:
Electrical
Product Group:
Boxes & Enclosures
Product Subgroup:
Box Covers

Pass & Seymour 4RBC – Frequently Asked Questions

1) Is the 4RBC round blank cover UL Listed for closing off an abandoned junction box?
The 4RBC is UL Listed, which is what an inspector looks for when you cap an unused 4-inch round box and leave the splices accessible behind it. It is a flat blank plate with no knockouts or device holes, so the box is fully closed once it is screwed down.
2) What is the difference between the Pass & Seymour 4RBC round blank cover and the Mulberry 11700 blank cover?
Both are blank covers, meaning neither has a device opening, but they differ in material and the box they close. The Pass & Seymour 4RBC is molded thermoplastic in gray and is sized for 4-inch round outlet boxes. The Mulberry 11700 is an F-35 Series galvanized steel oval/round blank cover in a 3/4-inch size, so it suits an oval or round box of that size rather than a 4-inch round box. If the opening in front of you is a standard 4-inch round box, the 4RBC is the match; if it is a small 3/4-inch oval or round body, the Mulberry is the one that lands.
3) Thermoplastic or steel round blank cover, which should I use?
The Pass & Seymour 4RBC is molded thermoplastic in gray, which is non-conductive and will not rust, so it suits interior dry-location boxes and remodel closeouts. If you need a metal cover, ZenSupply carries the Mulberry 11700 F-35 Series galvanized steel oval/round blank cover in a 3/4-inch size, which is the choice where a steel plate is specified or where bonding continuity through the cover is wanted. The two are not interchangeable in size, so match the cover to the box opening.
4) How many 4RBC covers come in a pack?
The 4RBC ships 50 to a pack, which is how electricians and maintenance crews buy it for multi-unit work or a rough-in where dozens of round boxes get capped at once. If you only need one or two, you are still buying the 50 pack.
5) Does the 4RBC blank cover come with mounting screws?
The 4RBC is described as a flat blank plate only. Plan on using the 8-32 machine screws that come with the outlet box itself, which is the standard thread for box cover and device mounting. If the box is reused and the screws are gone, pick up 8-32 cover screws separately.
6) Is the Pass & Seymour 4RBC made in the USA?
Yes, country of origin on the 4RBC round blank cover is the United States. Pass & Seymour is a Legrand brand, so this is useful on jobs with domestic sourcing requirements on the submittal.
7) Will a gray thermoplastic round cover match the other box covers on my ceiling?
The 4RBC is gray, which is the common utility color for unfinished ceilings, mechanical rooms, and garages, and it blends with standard gray box hardware. It is not offered in white or ivory, so on a finished painted ceiling expect to paint it or use a different cover.
How fast can I get the Pass & Seymour 4RBC 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 Pass & Seymour 4RBC come with a warranty?
Absolutely. The Pass & Seymour 4RBC 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 Pass & Seymour 4RBC?
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 Pass & Seymour 4RBC 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.
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