450mm Square to Round Solid Top Manhole Cover, 3.5 Tonne

The CD 456 is a 450mm diameter solid top manhole cover and frame designed for PPIC inspection chambers and similar chamber systems requiring a square external frame with round access opening. It is commonly specified where chamber types vary on site or where a square frame gives cleaner integration into surrounding paving or surfacing.

With a 35kN load rating, this cover is suitable for domestic driveways and light vehicular traffic areas. It is intended for cars and similar loads rather than regular heavy commercial vehicle use.

The polypropylene construction keeps the unit lightweight compared with metal alternatives while avoiding rust. This makes handling easier during installation and future chamber access. The slip-resistant tread pattern improves grip underfoot in wet external conditions.

A common mistake is measuring only the lid or outside frame. The key dimension is the 450mm clear opening, which must suit the chamber access point. The extended frame helps achieve a neater finished level against surrounding surfaces.

Dual locking secures the lid to the frame and the frame to the chamber for improved stability and security

• 450mm clear opening suits common inspection chamber access sizes
• Square to round design fits square or round compatible chambers
• 35kN load rating suitable for domestic driveways
• Dual locking secures lid and frame assembly
• Extended frame helps level to surrounding finished surfaces
• Polypropylene construction will not rust in normal external use
• Lightweight unit aids installation and maintenance access
• Slip-resistant tread pattern improves grip underfoot
• Compatible with reducer ring for restricted access applications

Manufactured from polypropylene grade AP9. This material offers low weight, good durability and resistance to moisture, making it suitable for chamber covers and drainage access components.

Product type: Solid top manhole cover and frame
Suitable location: External
Clear opening: 450mm diameter
Overall frame size: 560mm x 560mm
Tray depth (recess depth): Not applicable
Frame depth: 86mm
Overall depth: 130mm
Material: Polypropylene Grade AP9
Finish: Black
Seal type: Plain seated
Locking: Dual locking
Load rating: 35kN, 3.5 tonne
Lifting method: Unlock and lift cover
Fixings supplied: Integrated locking points
Weight: 7.5kg
Standards: FACTA 7.0, 7.2, 7.2.1, 7.2.3, 7.3.3
Options: Compatible with CD 499 reducer ring