Allegro Manhole Guard Rail – High-Visibility Temporary Barrier for Confined Space Entry
The Allegro Manhole Guard Rail (Item #9401) is a one-piece, no-tools-required temporary barrier railing designed for utilities, construction, sewer, and confined space work sites. Constructed from 1-inch diameter, 0.078-gauge tubular steel and finished in powder-coated safety yellow, it provides durable, high-visibility protection around open manholes. The rail locks open and includes two hooking chains for secured entry and exit, making it a practical solution for contractors who need fast setup and reliable perimeter control. Per OSHA 1910.146(c)(5)(ii)(B), this assembly is intended for use as a temporary barrier railing only.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | ALLEGRO |
| Item # | 9401 |
| UPC | 741851940021 |
| Length (packaged) | 46" |
| Width (packaged) | 35" |
| Height (packaged) | 4" |
| Weight | 45 lbs. |
| Steel Gauge | 0.078-gauge |
| Tubing Diameter | 1" (2.5 cm) |
| Finish | Powder-coated, safety yellow |
| Available Sizes | 33" or 42" |
| Applications | Utilities, Construction, Confined Space, Sewer |
| Technical Tips | Use with Allegro tents, umbrellas, shelters, and winch |
| Country of Origin | China |
| Regulatory Reference | OSHA 1910.146(c)(5)(ii)(B) – Temporary Barrier Railing |
Available Items
| Item # | Description | Dimensions | Weight |
|---|---|---|---|
| 9401 | Manhole Guard Rail – 33" size | 33" L x 33" W x 42.25" H | 39 lbs. |
| 9401-05 | Manhole Guard Rail – 42" size | 42" L x 42" W x 42.25" H | 47 lbs. |
Unlike basic rope barriers or cone setups, the Allegro Manhole Guard Rail offers a rigid, lockable steel structure with integrated hooking chains and welded marker flags — providing a more secure and OSHA-referenced perimeter solution. Its collapsible, one-piece design means it can be deployed and stowed without tools, reducing setup time compared to multi-component barrier systems. Compatibility with Allegro tents, umbrellas, and winches (PN 9401) extends its utility across a range of confined space access scenarios.
Key Features & Benefits
High-Quality 0.078-Gauge Steel Construction
The rail is built from strong 1-inch (2.5 cm) diameter tubular steel at 0.078-gauge thickness, delivering the structural rigidity needed to withstand job site conditions. This heavy-duty construction ensures the barrier holds its position around open manholes without deforming under incidental contact.
No-Tools, One-Piece Assembly
The simple one-piece design allows contractors to deploy the guard rail quickly without any tools, saving valuable setup and tear-down time on busy job sites. The rail locks open in position, eliminating the need for additional fasteners or hardware.
Two Hooking Chains for Secured Entry and Exit
Two chains with hooks provide a controlled access point, ensuring workers can enter and exit the confined space safely while the perimeter remains protected. This feature helps maintain a defined, secured opening rather than leaving the entire barrier open.
Safety Yellow Powder-Coated Finish
The durable powder-coated safety yellow finish provides high visibility to alert nearby workers and equipment operators of the open manhole hazard. The finish also adds corrosion resistance, extending the service life of the rail in outdoor and wet environments.
Support Arm and Welded Marker Flags
An integrated support arm gives the guardrail added structural support, while two welded marker flags enhance site visibility and warning capability. The rail can also accommodate additional signs, flags, or lights for further hazard communication.
Collapsible for Easy Portability and Storage
The guard rail collapses flat for straightforward transport between job sites and compact storage in a service vehicle. This portability makes it practical for crews managing multiple confined space access points across a project.
Common Applications
Utility Maintenance and Repair
Provides a temporary barrier around open manholes during utility inspection, maintenance, or repair operations, protecting both workers and the public from fall hazards.
Sewer and Stormwater Access
Secures the perimeter of sewer and stormwater manhole openings during confined space entry, supporting compliance with OSHA 1910.146 temporary barrier requirements.
Construction Site Confined Space Entry
Used on construction sites wherever workers must access below-grade confined spaces, providing a visible and lockable barrier at the entry point.
Use with Allegro Tents, Umbrellas, and Winches
The 9401 model is compatible with Allegro guard rail tents, umbrellas, and shelters, allowing contractors to create a weather-protected confined space entry station. It also supports use with an Allegro winch for personnel or equipment retrieval.
Compatible Materials
- Round manhole openings (33" or 42" sizes available)
- Square manhole openings (33" or 42" sizes available)
- Compatible with Allegro guard rail tents, umbrellas, and shelters
- Compatible with Allegro winch (PN 9401)
- Accommodates signs, flags, and lights for additional hazard marking
Product Documents
Frequently Asked Questions
Q: Is this guard rail compliant with OSHA confined space entry requirements?
A: This assembly is designed to be used as a temporary barrier railing per OSHA 1910.146(c)(5)(ii)(B). Contractors should verify their specific site requirements against applicable OSHA standards.
Q: What sizes are available?
A: The Manhole Guard Rail is available in two sizes: 33" (Item #9401, 33" L x 33" W x 42.25" H, 39 lbs.) and 42" (Item #9401-05, 42" L x 42" W x 42.25" H, 47 lbs.).
Q: Can the guard rail be used with other Allegro accessories?
A: Yes. The 9401 model is compatible with Allegro guard rail tents, umbrellas, shelters, and a winch, allowing it to serve as the foundation for a more complete confined space entry station.
Q: Does assembly require any tools?
A: No. The one-piece construction is designed for no-tools assembly, allowing fast deployment and tear-down on the job site.
Q: How is the entry point secured?
A: The rail locks open in position, and two chains with hooks provide a controlled, secured entry and exit point around the manhole opening.