4″ x 30.5″ Manhole Frame and Cover (1012D)

The 4″ x 30.5″ Manhole Frame and Cover (1012D) is a wide-access cast iron utility casting designed for sewer systems, storm drainage structures, underground vaults, treatment facilities, and public works infrastructure requiring a larger service opening with a lower-profile frame depth. With a 30.5″ clear opening, 31.75″ cover diameter, and 38.25″ outside frame diameter, the 1012D provides increased accessibility for maintenance crews while maintaining a compact 4″ frame height for shallow or elevation-sensitive installations.

Manufactured from cast iron and classified as heavy duty, this frame and cover is suited for municipal, commercial, industrial, and utility environments where durability, dimensional stability, and dependable access are required. The 1012D is especially useful when a project calls for a larger access diameter than a standard 24″ frame and cover but does not require the deeper frame profile of larger roadway castings.

Product Features

• 30.5″ clear access opening
• 4″ low-profile frame height
• Heavy duty cast iron construction
• 31.75″ cover diameter
• 38.25″ outside frame diameter
• Precision seating surface for stable cover placement
• Suitable for sewer, stormwater, utility, and infrastructure access
• Lower frame depth for shallow installation conditions
• Compatible with precast and cast-in-place structures
• Available with standard or custom markings
• Optional asphaltic coating available
• Designed for long-term utility service
• Manufactured for municipal and commercial applications

Designed for Larger Access with a Lower Frame Profile

The 1012D provides the benefit of a larger 30.5″ access opening while using a 4″ frame height. This combination makes it a practical choice for projects where crews need improved entry clearance, but site conditions do not call for a deep frame section.

A low-profile frame can be valuable in structures with limited vertical space, shallow cover conditions, rehabilitation projects, and utility access points where elevation control is important. The wider opening improves serviceability while the reduced frame depth helps simplify placement in compatible structures.

Common Applications

The 4″ x 30.5″ Manhole Frame and Cover (1012D) is commonly used for:

Sanitary Sewer Access

Provides service access to wastewater collection systems, inspection chambers, and sewer maintenance structures.

Stormwater Infrastructure

Suitable for drainage structures, storm sewer systems, and municipal runoff management facilities.

Utility Vaults

Used for electrical, communications, water, and general utility access where a larger opening is required.

Wastewater Treatment Facilities

Provides access to underground chambers, process structures, and maintenance points within treatment environments.

Public Works Projects

Appropriate for municipal infrastructure, roadway utility systems, and city or county maintenance applications.

Industrial Facilities

Useful for plants, terminals, distribution centers, and commercial properties requiring durable access castings.

Technical Specifications

Engineering Dimensions

These dimensions provide a wide access opening while preserving a lower installed profile for projects where elevation, slab depth, or structure geometry must be carefully managed.

Benefits of the 1012D Configuration

Larger Maintenance Opening

The 30.5″ clear opening gives crews additional room for inspection, equipment handling, and service work compared to smaller 24″ access assemblies.

Lower Installed Height

The 4″ frame depth provides a compact profile for shallow structures, utility retrofits, and applications where additional frame depth is not required.

Broad Utility Compatibility

The 1012D can be used across multiple infrastructure categories, including wastewater, stormwater, electrical, communications, and general utility access.

Practical Retrofit Option

For rehabilitation work, replacement projects, or upgrades to existing access points, the lower frame height may help simplify installation where structural depth is limited.

Strong Bearing Geometry

The 38.25″ outside frame diameter provides a broad footprint to support stable placement within the surrounding concrete structure.

Cast Iron Performance

Cast iron remains a preferred material for access frames and covers because it offers strong compressive performance, dimensional consistency, and proven durability in underground utility environments.

The material performs well in locations exposed to vehicle loading, moisture, temperature changes, and recurring maintenance activity.

Utility Markings Available

Amercast can provide cast-in cover markings for a wide range of applications, including:

• SANITARY SEWER
• STORM
• DRAIN
• WATER
• ELECTRIC
• TELEPHONE
• COMMUNICATIONS
• FIBER OPTIC
• GAS
• RECLAIMED WATER
• MUNICIPAL LOGO
• CUSTOM LETTERING

Custom identification helps municipalities, utilities, and contractors clearly mark underground infrastructure for maintenance and ownership purposes.

Available Project Options

Amercast can supply the 1012D with project-specific enhancements, including:

• Custom Cover Lettering
• Municipal Logos
• Utility-Specific Markings
• Protective Asphaltic Coating
• Specialty Pick Hole Configurations
• Bolt-Down Options
• Locking Configurations
• Watertight Variations
• Ductile Iron Options
• Agency-Specific Modifications

These options allow the casting to be matched to local standards, utility requirements, and project specifications.

Custom Municipal Casting Capabilities

Amercast manufactures cast iron access products for municipalities, utility authorities, contractors, engineers, transportation agencies, and industrial customers throughout North America.

Custom capabilities include:

• Large-Diameter Access Covers
• Utility Access Frames
• Sewer and Storm Castings
• Specialty Cover Markings
• Logo Castings
• Security Covers
• Watertight Assemblies
• DOT-Specific Castings
• Public Works Standards
• Project-Based Casting Designs

Our team can help develop castings that align with city, county, DOT, utility authority, or engineering requirements.

Related Products

• Manhole Frames and Covers
• 6.5″ x 30″ Manhole Frame and Cover (1012A)
• 6″ x 24″ Heavy Duty Manhole Frame and Cover
• 8″ x 24″ Heavy Duty Manhole Frame and Cover
• 8″ x 24″ Bolted Manhole Frame and Cover
• Adjustable Manhole Risers
• Manhole Risers and Extension Rings
• Catch Basin Grates
• Municipal Castings

Industry Resource

For additional information on public infrastructure, utility access, and municipal engineering practices:

American Public Works Association (APWA)

APWA provides technical resources and educational guidance for public works professionals, engineers, and infrastructure owners.

Why Choose Amercast?

Amercast supplies durable cast iron access products for utility systems, public works departments, contractors, engineers, and infrastructure owners. Our frame and cover assemblies are developed to support practical installation, dependable access, and long-term field performance.

Whether your project requires a standard casting, a large-diameter frame and cover, custom markings, or a specialized municipal configuration, Amercast can provide products tailored to your requirements.

Request a Quote

Need pricing, drawings, custom markings, or technical support?

Contact Amercast today to request a quote for the 4″ x 30.5″ Manhole Frame and Cover (1012D). Our team can assist with municipal, utility, commercial, stormwater, wastewater, and infrastructure projects throughout North America.