Description
3″ x 18″ Septic Manhole Frame and Cover
The 3″ x 18″ Septic Manhole Frame and Cover is a compact cast iron access assembly engineered for septic tanks, residential wastewater systems, onsite sewage treatment systems, and light-duty utility applications. Designed to provide dependable access to underground septic components while maintaining a clean finished appearance, this frame and cover offers a durable alternative to plastic and composite access covers.
Featuring an 18-inch cover diameter, 16-inch clear opening, and a low-profile 3-inch frame height, this assembly is well suited for residential properties, small commercial installations, septic riser systems, and private wastewater infrastructure. Its compact dimensions allow easy access for routine inspections, pumping operations, filter maintenance, and servicing of septic system components.
Manufactured from cast iron, the 3″ x 18″ Septic Manhole Frame and Cover delivers long-term performance in outdoor environments while helping protect septic access points from damage, unauthorized entry, and environmental exposure. Optional bolt-down configurations and custom cast markings are available for projects requiring additional security or identification.
Product Features
- 18″ cover diameter
- 16″ clear access opening
- 3″ frame height
- Cast iron construction
- Designed for septic tank access
- Suitable for residential and light commercial applications
- Low-profile installation
- Optional bolt-down configuration available
- Available with custom cast lettering
- Compatible with septic risers and access extensions
- Optional protective coating available
- Long-lasting service life
- Easy access for maintenance and inspections
Designed for Septic System Accessibility
Routine septic system maintenance requires reliable access to underground components. The 3″ x 18″ frame and cover provides a practical solution for accessing septic tanks, distribution boxes, filters, and treatment system components without requiring extensive excavation.
The compact design makes it ideal for residential properties where visual impact is important while still providing sufficient clearance for inspection and service activities.
Benefits include:
- Simplified maintenance access
- Easier septic inspections
- Convenient pumping access
- Reduced excavation requirements
- Improved system accessibility
- Long-term durability
Common Applications
The 3″ x 18″ Septic Manhole Frame and Cover is frequently used in:
Residential Septic Systems
Provides access to septic tanks for pumping, inspection, and routine maintenance activities.
Septic Tank Risers
Commonly installed with riser systems to bring access points closer to finished grade.
Aerobic Treatment Units
Allows service access to treatment components and system controls.
Small Commercial Wastewater Systems
Suitable for restaurants, offices, retail facilities, and light commercial wastewater applications.
Rural Properties
Provides durable access for private onsite wastewater treatment systems.
Residential Developments
Frequently specified for new home construction and septic system upgrades.
Technical Specifications
| Property | Specification |
|---|---|
| Product Type | Septic Manhole Frame & Cover |
| Material | Cast Iron |
| Cover Diameter (C) | 18″ |
| Frame Height (D) | 3″ |
| Clear Opening (E) | 16″ |
| Cover Thickness (H) | 1″ |
| Application | Septic Systems |
| Installation Type | Septic Tanks & Risers |
| Cover Style | Solid Cover |
| Optional Features | Bolts, Markings, Coatings |
Engineering Dimensions
| Dimension | Description | Measurement |
|---|---|---|
| C | Cover Diameter | 18″ |
| D | Frame Height | 3″ |
| E | Clear Opening | 16″ |
| H | Cover Thickness | 1″ |
The dimensional configuration provides sufficient access for common septic maintenance operations while maintaining a compact footprint suitable for residential installations.
Advantages of Cast Iron Septic Covers
Many septic system owners continue to choose cast iron over plastic, rubber, and composite alternatives because of its proven durability and structural integrity. Cast iron provides excellent resistance to impact, weather exposure, and long-term ground contact conditions. and repeated service cycles. with system identification while enhancing the appearance of the installation. requirements. conditions.
