Mulberry 40601 Polyethylene Fo...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$0.41
Mulberry 40601 Polyethylene Foam Energy Saving Insulating Gasket for 1-Gang Duplex

Mulberry 40601 Polyethylene Foam Energy Saving Insulating Gasket for 1-Gang Duplex

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Model: 40601

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

$0.41
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Mulberry 40601 Polyethylene Foam Energy Saving Insulating Gasket for 1-Gang Duplex

The Mulberry 40601 Polyethylene Foam Energy Saving Insulating Gasket is built for use with 1-Gang Duplex devices, giving electricians and facility teams a simple way to help cut down on air infiltration around outlets and switches. Made from lightweight polyethylene foam, the gasket fits behind the wallplate to help close small gaps that can let in drafts, dust, and moisture at a single-gang duplex opening. It's an economical, easy-to-install accessory for any residential or commercial job where energy efficiency and weatherization matter. The Mulberry 40601 pairs with standard 1-Gang Duplex receptacles and wallplates without requiring any special tools or hardware.

Key Features

  • Configuration: Sized for 1-Gang Duplex devices, so it fits standard single-gang outlet and switch openings.
  • Durable Construction: Polyethylene foam material is lightweight and flexible, allowing it to compress evenly behind the wallplate for a consistent seal.
  • Energy Saving Design: Helps reduce air infiltration and drafts around the duplex opening, supporting better energy efficiency in the surrounding wall cavity.
  • Simple Installation: Installs behind the device and wallplate on a standard 1-Gang Duplex opening with no special tools required.
  • Economical Accessory: A low-cost way to add basic air-sealing to new or existing duplex receptacle and switch installations.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Residential and Commercial Wall Outlets
  • Energy Efficiency and Weatherization Retrofits
  • New Construction Electrical Installations
  • Single-Gang Duplex Receptacle and Switch Openings
  • General Air-Sealing Around Wiring Devices

Why Mulberry?

Mulberry designs practical, functional electrical accessories like the 40601 insulating gasket to help contractors and facility teams address everyday air-sealing needs at the device level. The polyethylene foam construction offers a straightforward, reliable way to complement standard 1-Gang Duplex devices in energy-conscious residential and commercial installations, making it a handy addition to any electrician's stock of wiring device accessories.

Manufacturer Resources

Mulberry Full Line Catalog

Product Specs

Department:
Electrical
Product Group:
Boxes & Enclosures
Product Type:
Insulating Gasket
Product Subgroup:
Enclosure Accessories

Mulberry 40601 – Frequently Asked Questions

1) What does the Mulberry 40601 foam gasket actually do behind a wallplate?
The 40601 is a polyethylene foam gasket that sits between the wiring device and the wallplate at a single-gang duplex opening. Foam compresses when the plate screws down, closing the small gaps around the device that let drafts, dust, and moisture pass from the wall cavity into the room. It is an air-sealing accessory, not an electrical insulator for conductors.
2) Will the Mulberry 40601 fit a standard single-gang duplex receptacle opening?
Yes. The 40601 is cut for 1-gang duplex devices and pairs with standard single-gang receptacles and wallplates. If your opening is a two-gang, three-gang, or a decorator/rocker style cutout, this one is the wrong shape and you need the gasket matched to that configuration.
3) Do I need special tools or hardware to install a foam outlet gasket?
No. The 40601 goes on with nothing but the wallplate screw you already have. Pull the plate, lay the foam over the device, reseat the plate. No adhesive, no fasteners, no trimming required on a standard duplex opening.
4) Can I add these gaskets to outlets that are already installed, or are they only for new work?
Both. On existing openings you only remove the wallplate to slip the gasket in, which is why these get specified on weatherization and energy-efficiency retrofits as well as new construction electrical rough-ins. Property managers commonly run a building sweep this way, one plate at a time.
5) Is the Mulberry 40601 rated for exterior or wet-location outlets?
Treat the 40601 as an interior air-sealing gasket for residential and commercial wall outlets. It reduces infiltration of drafts, dust, and moisture at the device opening, but it is not a weatherproof cover and does not replace an in-use cover or a gasketed weatherproof plate on an exterior receptacle.
6) What part number do I order for the Mulberry single-gang duplex insulating gasket?
Order Mulberry 40601. That is the polyethylene foam energy-saving gasket for the 1-gang duplex configuration, and it is the only model under that designation.
7) Will a foam gasket work behind a switch plate as well as a receptacle plate?
Yes, as long as the opening is a standard single-gang duplex cutout. The 40601 is used on single-gang duplex receptacle and switch openings alike, since the foam seals the perimeter of the device opening rather than the device itself.
How fast can I get the Mulberry 40601 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 Mulberry 40601 come with a warranty?
Absolutely. The Mulberry 40601 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 Mulberry 40601?
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 Mulberry 40601 from ZenSupply?
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