Block Paving Manhole Cover / Square to Round Infill Cover
The CD450SR block paving manhole cover gives a square paved finish over a 450mm circular inspection chamber. Its 80mm galvanised steel tray takes block paving or slabs, and the square to round infill design removes the need to cut blocks around a round opening. Set in a polypropylene frame at 585 x 585 x 88mm overall, the cover weighs 12kg and is rated to 10 tonnes GPW.
Specifications
| Product code | CD450SR |
| Product type | Recessed paving cover and frame |
| Clear opening | 450mm diameter |
| Overall dimensions | 585 x 585 x 88mm |
| Tray depth | 80mm |
| Tray material | Galvanised mild steel |
| Frame material | Polypropylene, Grade AP9 |
| Load rating | 10 tonnes GPW |
| Load test | 25kN held for 30 seconds |
| Galvanising | BS EN 1461:2009 |
| Lifting handles | Tested to 60kg direct lift |
| Weight | 12kg |
| Locking | None |
Key Design Features
The galvanised steel tray sits within a square polypropylene frame with a circular opening below. A moulded grouting flange supports secure bedding, while integrated lifting handles allow access for inspection and maintenance.
Benefits
- Allows block paving or slabs to continue across the access cover.
- Reduces cutting around a circular inspection chamber.
- Rotates to match the direction of the surrounding paving.
- Maintains access without interrupting the finished surface layout.
- Galvanised steel helps protect the tray in external installations.
Applications
The CD450SR is suitable for patios, garden paths, driveways and landscaped areas where the paving needs to run unbroken across the chamber. The 80mm tray takes standard block paving, and the 10 tonne GPW rating covers domestic vehicle traffic across a driveway.
Contact Us for Expert Advice
Explore our full range of block infill covers For help selecting the right block paving manhole cover or to confirm compatibility with existing systems, contact us today. Our team provides technical support and product guidance to professionals across the UK drainage and construction sector.


