Mulberry 30377-3 Weatherproof ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$5.67
Mulberry 30377-3 Weatherproof Round Cover, Die-Cast Zinc

Mulberry 30377-3 Weatherproof Round Cover, Die-Cast Zinc

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Model: 30377Z

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

$5.67
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Mulberry 30377-3 Weatherproof Round Cover, Die-Cast Zinc

The Mulberry 30377-3 Weatherproof Round Cover is a die-cast zinc cover built for outdoor, exposed, and general-purpose electrical installations where dependable protection matters. This 4-Inch round cover features a powder-coated finish that resists corrosion, rust, and weathering across seasonal exposure, and is available in a choice of Bronze, Gray, or White finish colors to match jobsite conditions or aesthetic preferences. Designed to seal and protect round electrical boxes, conduit bodies, and related enclosures from moisture, dust, and debris, the 30377-3 gives electricians and contractors a rugged, code-conscious cover option for professional installations across commercial and residential jobsites.

Key Features

  • Trade Size: 4-Inch round cover sized for standard electrical box and conduit body openings, simplifying fitment on common enclosures.
  • Durable Construction: Die-cast zinc body resists impact, denting, and deformation, providing long-term structural integrity for outdoor and industrial use.
  • Powder-Coated Finish: Protective powder-coat layer improves corrosion and rust resistance and extends service life when exposed to sun, rain, and temperature swings.
  • Weatherproof Design: Round cover profile helps seal out moisture, dust, and debris from the electrical enclosure it protects, supporting reliable long-term performance.
  • Round Cover Configuration: Low-profile round shape is suited to standard round electrical box and fitting installations for a clean, secure fit.
  • Finish Color Options: Available in Bronze, Gray, or White powder-coated finishes, letting contractors match the cover to the surrounding installation.
  • Zinc Alloy Body: Die-cast zinc construction offers a strong strength-to-weight balance compared to lighter stamped covers, useful where added durability is preferred.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Outdoor Electrical Box and Enclosure Covers
  • Weatherproof Conduit Body Installations
  • Wet and Damp Location Electrical Wiring
  • Commercial and Residential Outdoor Electrical Work
  • Renovation and New Construction Electrical Projects
  • Round Box Cover Replacement on Existing Installations

Why Mulberry?

Mulberry builds electrical fittings like the 30377-3 with durable die-cast zinc construction and a protective powder-coated finish, giving contractors and electricians a dependable weatherproof cover for demanding outdoor applications. Available in Bronze, Gray, and White finishes, this combination of rugged materials and corrosion-resistant finishing supports reliable, long-lasting performance in professional electrical installations, helping keep round electrical boxes and conduit bodies protected from the elements. For electricians who need a straightforward, durable round cover in the color that fits the job, the Mulberry 30377-3 is a practical choice for both new construction and maintenance work.

Manufacturer Resources

Mulberry Full Line Catalog

Product Specs

Product Group:
Wiring Devices
Product Type:
Weatherproof Cover
Product Size:
4-Inch
Department:
Electrical
Product Material:
Die-Cast Zinc
Product Finish:
Powder-Coated
Configuration:
Round
Product Subgroup:
Weatherproof Covers

Mulberry 30377Z – Frequently Asked Questions

1) I need a self-closing weatherproof cover for an outdoor receptacle. Is this the right part?
No. The Mulberry 30377-3 is a 4-inch round blank-style weatherproof cover for round boxes and conduit bodies, not a self-closing receptacle cover. For a device opening you want a self-closing gasketed cover such as the Leviton 7788-CR or the industrial grade Leviton 7420, both 1-gang glass-filled thermoplastic self-closing covers.
2) What is the difference between the Mulberry 30377-3 round weatherproof cover and a Leviton 7788-CR weatherproof cover?
They cover different openings and are built from different materials. The Mulberry 30377-3 is a 4-inch round cover in die-cast zinc with a powder-coated finish, made to close round electrical boxes and conduit bodies. The Leviton 7788-CR is a 1-gang self-closing weatherproof cover molded in glass-filled thermoplastic, so it suits a 1-gang device opening rather than a round box. Match the cover to the box shape you actually have in the wall or on the conduit run.
3) Is a die-cast zinc cover better than a plastic weatherproof cover for an exterior wall?
Zinc and plastic answer different concerns. The Mulberry 30377-3 is die-cast zinc with a powder-coated finish, so it takes impact and denting better than a stamped or molded cover and it holds up to sun, rain and temperature swings. Glass-filled thermoplastic covers, like the Leviton 7788-CR self-closing weatherproof cover, will not corrode at all and are the usual pick where salt air or chemical exposure is the concern. For a loading dock, parking structure or anywhere the cover can get hit, the metal cover is the more durable choice.
4) Can the Mulberry 30377 be used on a conduit body outdoors?
Yes. The 30377 round cover is intended to seal round electrical boxes, conduit bodies and similar enclosures against moisture, dust and debris in outdoor and exposed locations. Match it to a 4-inch round opening.
5) Is there a non-metallic alternative to the die-cast zinc Mulberry 30377-3 cover?
Yes, if the opening is a 1-gang device box. The Leviton 7420 and Leviton 7788-CR are both glass-filled thermoplastic weatherproof covers, which is a non-metallic body, while the Mulberry 30377-3 is die-cast zinc with a powder-coated finish. Thermoplastic is often chosen on coastal or corrosive sites; the zinc Mulberry cover is the round-box option and resists impact and denting.
6) Do the Leviton 7420 and 7788-CR covers carry a grade rating that the Mulberry 30377-3 round cover does not?
Both Leviton covers are rated Industrial grade, which is the spec institutional and MRO buyers usually write into a standardization package for 1-gang receptacle covers. The Mulberry 30377-3 is specified instead by its construction: die-cast zinc, powder-coated, 4-inch round for boxes and conduit bodies. If your facility standard calls out an industrial grade 1-gang cover, the Leviton parts are the ones written to that language.
7) Will the powder coat on this cover hold up on a coastal or high-sun exposure?
The zinc body carries a powder-coated layer specifically for corrosion and rust resistance through sun, rain and temperature cycling. That is the wear surface, so keep the coating intact when you drill or file, and touch up any bare zinc you expose during install.
8) Can I use one color for a bronze light fixture and another elsewhere on the same job?
Yes, and property managers standardizing across a building often do exactly that. The same 4-inch round zinc cover is stocked as Gray (30377), White (30377W) and Bronze (30377Z), so you can order mixed quantities and keep every opening matched to its wall or fixture without changing part families.
9) Do the Leviton weatherproof covers come in bronze, gray, and white like the Mulberry 30377-3?
The Mulberry 30377-3 is offered in three powder-coated colors: Gray (30377), White (30377W), and Bronze (30377Z), which lets you match the cover to trim or masonry on the elevation. The Leviton 7420 and 7788-CR are self-closing 1-gang covers in glass-filled thermoplastic and are selected mainly on the 1-gang opening and industrial grade rather than on a matching color range. Where appearance drives the choice on a round box, the Mulberry color options are the ones to specify.
How fast can I get the Mulberry 30377Z 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 30377Z come with a warranty?
Absolutely. The Mulberry 30377Z 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 30377Z?
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 30377Z from ZenSupply?
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