Pass & Seymour C118WGAC 3.75-i...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$61.11
$10.46
Pass & Seymour C118WGAC 3.75-in Round Old Work Box

Pass & Seymour C118WGAC 3.75-in Round Old Work Box, Black Thermoplastic

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Model: C118WGAC

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

$61.11
$10.46
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Pass & Seymour C118WGAC 3.75-in Round Old Work Box, Black Thermoplastic

The Pass & Seymour C118WGAC is a 3.75-in round old work box built from high-impact thermoplastic for retrofit device and fixture installations. This UL Listed box is suitable for in-wall and in-ceiling use, supporting weights of up to 6 lbs. when mounted overhead, and its swing-out wing bracket design lets installers work with wallboard from 1 1/4 inch thick down to 1/8 inch thick paneling without cutting into new construction.

Key Features

  • Trade Size: 3.75-in round old work box sized for standard retrofit device and fixture openings.
  • Durable Construction: Molded from high-impact thermoplastic for a rugged, long-lasting enclosure in black.
  • Weight Rating: Suitable for in-ceiling use, supporting weights of up to 6 lbs.
  • Extended-Reach Brackets: New longer swing brackets have greater reach to clamp securely onto oversize cutouts.
  • Wall Thickness Range: Swing-out wing brackets permit installation in wallboard from 1 1/4 inch thick down to 1/8 inch thick paneling.
  • Flush-Fit Design: Box is designed so the device mounting strap, with plaster ears removed, sits flush, allowing use of a standard depth wallplate without an unsightly gap.
  • Auto/Clamp Feature: Includes the exclusive Auto/Clamp feature plus combination slotted/Phillips head swing bracket screws for fast installation.
  • Device Mounting Holes: Pre-formed device mounting holes simplify device attachment in the field.

Certifications & Compliance

  • UL Listed

Technical Specifications

  • Country Of Origin: United States
  • Product Color: Black
  • Product Line: Pass & Seymour

Typical Applications

  • Retrofit and Old Work Electrical Installations
  • Ceiling-Mounted Fixture and Device Support
  • Residential and Commercial Wall Device Boxes
  • Renovation Projects Requiring Non-New-Construction Boxes

Why Pass & Seymour?

Pass & Seymour engineers this old work box with UL Listed, high-impact thermoplastic construction and an Auto/Clamp swing bracket system built for reliable, code-compliant retrofit installations. The extended-reach brackets and flush-fit device strap design help electrical professionals deliver a clean, secure finish without cutting oversize openings.

Manufacturer Resources

Spec Sheet

Product Specs

Product Type:
Old Work Box
Product Material:
Thermoplastic
Product Color:
Black
Product Size:
3.75-in
Listing:
UL Listed
Country of Origin:
United States
Department:
Electrical
Product Group:
Wiring Devices
Trade Size:
3.75-in

Pass & Seymour C118WGAC – Frequently Asked Questions

1) What size opening does a 3.75-in round old work box need cut in the wall?
The C118WGAC is a 3.75-in trade size round box, so the hole is cut to the box body. The useful part for a retrofit crew is what happens when the cut goes wide: the longer swing brackets on this box have extra reach to clamp onto an oversize cutout, so a hole sawed a little generously still pulls up tight instead of forcing a patch.
2) Old work box or new work box for a renovation where I can't open the wall?
An old work box like the C118WGAC is the one you want when the wall or ceiling is already closed. It carries its own clamping system (swing-out wing brackets plus the Auto/Clamp feature) and grips the wallboard itself, so nothing has to be nailed or screwed to a stud or joist. A new work box mounts to framing and requires the surface to be open. Use the old work box for retrofit devices and fixtures; use a new work box only where you have access to the studs.
3) Will a standard wallplate sit flush on this box, or do I get a gap?
Flush, with no gap. The C118WGAC is molded so the device mounting strap sits flush once the plaster ears are broken off, which lets a standard depth wallplate seat against the wall rather than standing proud on the strap. That is the detail that decides whether a retrofit device looks like an original install or a patch job.
4) Is the Pass & Seymour C118WGAC UL Listed for use in a commercial building?
The C118WGAC is UL Listed, and it is suitable for both in-wall and in-ceiling use. It is a nonmetallic box, molded from high-impact thermoplastic, which is what an inspector will be looking at when checking the wiring method it is paired with.
5) Does this box come with the mounting screws, or do I need to supply them?
The swing bracket screws come with the C118WGAC, and they are combination slotted/Phillips heads so whichever driver is already in your hand works. The box also has pre-formed device mounting holes for attaching the device itself. What you supply is the device, the wallplate, and your cable connectors.
6) Is the Pass & Seymour C118WGAC made in the USA?
Country of origin on the C118WGAC round old work box is the United States. That matters on government, healthcare, and education jobs where domestic sourcing is written into the procurement spec.
7) What part number do I order for the Pass & Seymour 3.75 inch round old work box?
Order it as Pass & Seymour C118WGAC. That is the full manufacturer part number for the 3.75-in round old work box in black thermoplastic; there are no finish or size options to pick, it ships as the one configuration.
8) Is the C118WGAC box black, and will it show through a smoke detector or fixture canopy?
The body is black high-impact thermoplastic. On a ceiling with a white canopy or detector base, a black box reads darker through any gap at the edge of the trim than a white or blue box would, so seat the trim tight. In a wall behind a device and plate it makes no difference.
How fast can I get the Pass & Seymour C118WGAC 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 C118WGAC come with a warranty?
Absolutely. The Pass & Seymour C118WGAC 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 C118WGAC?
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 C118WGAC from ZenSupply?
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