1. Product Overview
The Hubbell-Raco 731 Flat Single Duplex 4-Inch Octagon Cover is designed to securely close an electrical outlet box or to mount a single duplex receptacle. This cover is specifically made for 4-inch octagon electrical boxes and features a key-hole mounting design for simplified installation without the need to fully remove box screws.

Figure 1.1: Front view of the Hubbell-Raco 731 Flat Single Duplex 4-Inch Octagon Cover, showing the two receptacle openings and mounting holes.
2. Safety Information
Always prioritize safety when working with electrical components. Improper installation can result in electrical shock, fire, or personal injury. If you are unsure about any part of the installation process, consult a qualified electrician.
- Turn off power: Before beginning any electrical work, ensure the power to the circuit is turned off at the main service panel (breaker box). Verify with a voltage tester.
- Use appropriate tools: Use insulated tools and wear appropriate personal protective equipment.
- Follow local codes: All installations must comply with national and local electrical codes.
- Inspect components: Ensure all components, including the cover and electrical box, are free from damage before installation.
3. Product Features
- Designed for 4-inch octagon electrical boxes.
- Flat design for a flush finish.
- Accommodates a single duplex receptacle.
- Key-hole mounting feature allows for installation without fully removing box screws.
- UL Listed for safety and compliance.

Figure 3.1: Side view illustrating the flat profile of the cover.
4. Installation Instructions
This cover is designed for straightforward installation on a 4-inch octagon electrical box.
- Prepare the electrical box: Ensure the 4-inch octagon electrical box is properly installed and secured. Make sure all wiring is correctly terminated and safe.
- Mount the receptacle (if applicable): If installing a duplex receptacle, connect the wiring to the receptacle terminals according to electrical codes (typically black to brass, white to silver, ground to green). Secure the receptacle to the electrical box using the provided screws.
- Position the cover: Align the cover over the electrical box and the mounted duplex receptacle. The key-hole slots on the cover should align with the screws on the electrical box or receptacle mounting tabs.
- Secure the cover: Slide the cover into place so that the screws engage the narrow part of the key-hole slots. Tighten the screws until the cover is firmly secured against the electrical box and wall surface. Do not overtighten.

Figure 4.1: Back view of the cover, highlighting the key-hole mounting feature for easy installation.
5. Operation
Once installed, the Hubbell-Raco 731 cover provides a secure and finished enclosure for a single duplex receptacle within a 4-inch octagon electrical box. The cover protects the wiring and connections while allowing access to the receptacle for electrical devices.
6. Maintenance
The Hubbell-Raco 731 cover requires minimal maintenance. Periodically inspect the cover for any signs of damage, corrosion, or loose connections. Clean the surface with a soft, dry cloth as needed. Do not use abrasive cleaners or solvents.
7. Troubleshooting
- Cover does not fit flush: Ensure the electrical box is properly recessed or flush with the wall surface. Check for any obstructions behind the cover or within the box. Verify that the correct size (4-inch octagon) box is being used.
- Screws do not tighten: Ensure the screws are properly aligned with the key-hole slots and the threaded holes in the electrical box or receptacle. Do not force screws; re-align and try again.
- Receptacle is loose: Ensure the duplex receptacle is securely mounted to the electrical box before installing the cover.
8. Specifications
| Model Number | 731 |
| Brand | Hubbell-Raco |
| Product Dimensions | 4"W x 4"H |
| Material | Galvanized Steel (Note: Product specifications may sometimes list 'Plastic', but this product is typically made of metal for electrical applications, as confirmed by user feedback.) |
| Color | Silver |
| Finish Type | Unfinished |
| Configuration | Single Duplex Receptacle |
| Installation Type | Screw-In (Key-hole mounting) |
| Certifications | UL Listed |
9. Warranty Information
This Hubbell-Raco product comes with a 1 Year Manufacturer Warranty. For specific terms and conditions, please refer to the warranty documentation included with your purchase or contact Hubbell customer support.
10. Customer Support
For technical assistance, product inquiries, or warranty claims, please contact Hubbell customer support. Refer to the official Hubbell website or product packaging for the most current contact information.
You can also visit the Hubbell Store on Amazon for additional product information and resources.