Standard 450 x 450mm Square Manhole Cover, Cast Iron, A15 Load Rated

450mm Square Manhole Cover

The Standard 450 x 450mm Square Manhole Cover provides a durable and secure access point for domestic and light commercial drainage systems. This 18-inch by 18-inch unit features a heavy-duty cast iron construction designed to withstand pedestrian traffic and light landscaping equipment. It serves as a reliable solution for covering inspection chambers, grease traps, and sewer junctions in residential driveways or walkways.

Built for the Job

Contractors specify this drainage lid for its structural integrity and ease of installation in various surface types. The frame provides a stable base that sits flush with concrete, paving slabs, or tarmac, ensuring a trip-free finish on the job site. Because the material resists heavy oxidation, the unit maintains its structural strength even when exposed to constant moisture and underground gases. Plumbers and site supervisors prefer this specific size for standard inspection chambers where frequent access is necessary for maintenance or clearing blockages. The weight of the lid ensures it remains seated within the frame without rattling under foot traffic, while the integrated lifting points allow for efficient removal using standard manhole keys.

• Residential drainage networks and domestic sewer inspection points.

• Pedestrian walkways, garden paths, and light-duty paved areas.

• Protection for underground utility valves and water meter pits.

Product Highlights

Material Composition

High-grade cast iron provides superior compressive strength and long-term resistance to environmental wear.

Surface Protection

• Coated with a black bitumen finish to prevent corrosion.
• Anti-slip patterned surface improves safety in wet conditions.
• Precision-machined edges ensure a tight fit between lid and frame.

Technical Specifications

What’s Included

• 1 x 450mm x 450mm Cast Iron Cover

• 1 x Matching Cast Iron Support Frame

On-Site & Workshop Notes

• Always bed the frame in a high-strength mortar to prevent movement or cracking under load.

• Ensure the inspection plate is level with the surrounding finished floor surface to avoid trip hazards.

• Regularly clear debris from the frame seating area to maintain a proper seal and prevent the lid from rocking.

• This A15 rated unit is strictly for pedestrian areas and should not be used in roads or high-traffic commercial driveways.