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Bell 5399-0 1-Gang Weatherproof Extension Adapter, Aluminum, Gray
The Bell 5399-0 is a 1-Gang Weatherproof Extension Adapter engineered to extend an existing outdoor electrical box while preserving a weathertight enclosure. Built from durable aluminum with a gray finish, this extension adapter features two 1/2 in. threaded outlets and a 1.5 in. depth, giving electricians extra room to add fixtures, receptacles, or conduit connections to an installed box. It is UL Listed and CSA Certified, making it a dependable choice for exterior and wet-location electrical work. The adapter is ideal for contractors who need to add capacity to a weatherproof outlet box without disturbing existing wiring or replacing the entire enclosure.
Key Features
- Threaded Outlets: Two 1/2 in. threaded outlets for connecting conduit, fixtures, or additional devices to the extended box.
- Durable Construction: Aluminum, metallic construction resists corrosion and holds up under continued outdoor exposure.
- 1-Gang Configuration: Sized to mate with and extend a standard 1-gang weatherproof box.
- Extension Depth: 1.5 in. depth adds usable interior space to an existing box without requiring a full box replacement.
- Two-Outlet Design: Two outlets allow simultaneous connection points for wiring devices or conduit runs.
- Gray Finish: Gray color coordinates with common weatherproof box and cover finishes for a clean exterior appearance.
- Listed for Compliance: UL Listed and CSA Certified for use on code-compliant residential and commercial installations.
Certifications & Compliance
- UL Listed
- CSA Certified
Technical Specifications
- Product Type: Weatherproof Boxes & Extensions
- Product Material: Aluminum
- Product Color: Gray
- Product Depth: 1.5 in
- Construction: Metallic
- Box Type: 1-Gang
- Number Of Outlets: 2
- Certified Listed: UL Listed, CSA Certified
Typical Applications
- Extending Existing Weatherproof Boxes
- Outdoor Receptacle and Fixture Installations
- Wet and Damp Location Electrical Work
- Conduit Connections on Exterior Runs
- Commercial and Residential Exterior Wiring
- Renovation Projects Requiring Additional Box Capacity
Why Bell?
Bell weatherproof electrical products are built with corrosion-resistant materials and independently tested to UL and CSA standards, giving installers a dependable way to extend existing boxes without compromising a weathertight enclosure. The aluminum construction and metallic build of the 5399-0 provide the strength and durability professionals expect for exterior and wet-location electrical work, while the two 1/2 in. threaded outlets and 1.5 in. extension depth simplify adding capacity to installed 1-gang weatherproof boxes on code-compliant jobs.
Manufacturer Resources
Product Specs
- list_batch:
- BELL-20260916
- Box Type:
- 1-Gang
- Product Material:
- Aluminum
- Product Color:
- Gray
- Construction:
- Metallic
- Certified Listed:
- CSA Certified
- Product Type:
- Weatherproof Box Extension
- Department:
- Electrical
- Product Subgroup:
- Weatherproof Enclosures
- Product Group:
- Boxes & Enclosures
Bell 5399-0 – Frequently Asked Questions
1) What does the Bell 5399-0 weatherproof extension adapter actually do on an existing outdoor box?
The Bell 5399-0 is an extension adapter that bolts onto an installed 1-gang weatherproof box and adds 1.5 inches of interior depth, so you can add a receptacle, fixture, or conduit run without pulling the old box out of the wall or re-wiring it. It keeps the enclosure weathertight for exterior and wet-location work.
2) Which Bell extension adapter do I order if I need more than two conduit outlets?
Three Bell configurations are offered. Model 5399-0 has two 1/2 inch threaded outlets, 5400-0 has six 1/2 inch outlets, and 5405-0 has six 3/4 inch outlets. Pick by how many conduit runs land on the box and what trade size your raceway is: 1/2 inch EMT or rigid goes to the 1/2 inch versions, 3/4 inch conduit needs the 5405-0.
3) Will 1/2 inch conduit thread straight into the Bell 5399-0 adapter?
Yes. The outlets on the 5399-0 are 1/2 inch threaded hubs, so 1/2 inch threaded rigid conduit, a 1/2 inch fitting, or a threaded connector makes up directly. For 3/4 inch raceway you would order the 5405-0 instead, which carries six 3/4 inch threaded outlets.
4) Is the Bell 5399-0 extension adapter listed for code-compliant commercial work?
It is UL Listed and CSA Certified, which covers code-compliant residential and commercial exterior installations. That matters on inspected jobs and for facilities standardizing on listed weatherproof components.
5) Can I use this extension adapter on a 2-gang weatherproof box?
No. It is a 1-gang adapter, sized to mate with and extend a standard 1-gang weatherproof box. A two-gang enclosure needs a 2-gang extension ring with the matching mounting pattern.
6) Is an aluminum extension adapter okay for a coastal or wet-location exterior install?
The adapter is aluminum with metallic construction and a gray finish, which resists corrosion under continued outdoor exposure. It is intended for wet and damp location electrical work, including outdoor receptacles, fixtures, and exterior conduit runs.
7) Do I have to replace the whole outdoor box if I am adding a fixture during a renovation?
Not if the existing enclosure is a 1-gang weatherproof box in good condition. Stacking the 5399-0 adapter on it adds 1.5 inches of depth and two 1/2 inch threaded entries, which is usually enough to land a new fixture whip or conduit run and gain the wire volume for the added device, without disturbing the existing wiring.
8) Will the gray adapter match the weatherproof covers already on my building?
The finish is gray, chosen to coordinate with common weatherproof box and cover finishes, so on a property where the existing 1-gang exterior boxes and covers are the standard gray it blends without repainting.
How fast can I get the Bell 5399-0 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 Bell 5399-0 come with a warranty?
Absolutely. The Bell 5399-0 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 Bell 5399-0?
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selection,
installation tips, and troubleshooting. Contact Us
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