450mm Diameter Round to Square PP Manhole Cover & Frame 35kn

Product Description

Provide a durable, secure, and handsome access point for inspection chambers or underground drainage runs with this 450mm Diameter Round to Square PP Manhole Cover & Frame 35kn, rated to 35 kN (≈ 3.5 tonnes) loading. Built for areas where surfaces are paved, paved-block, tarmac, or other finishes that benefit from a square frame appearance, but where the chamber opening is circular, this product offers the best of both worlds: a round clear opening with a square top finish.

Constructed from high-grade polypropylene (PP), this cover & frame combination is designed to handle outdoor conditions, subsurface soil pressure, moisture, and occasional pedestrian or light vehicular load (in driveway/domestic contexts). The solid top cover gives a neat, flush finish and includes a slip-resistant tread pattern to reduce risk under wet conditions.

The frame dimensions (overall square size) are approximately 560mm × 560mm, and the frame depth is about 80mm, giving sufficient structure for bedding into surrounding surfacing materials while maintaining stability. The cover has a clear round opening of about 450mm diameter, ensuring compatibility with round chamber bases or risers.

Additional features include a secure locking mechanism (cover to frame and/or frame to chamber in some models) to prevent unauthorised lifting, as well as an extended frame lip allowing the frame to be levelled or adjusted to match surrounding surface slabs or paving without major modifications. Easy to install, this cover & frame unit is designed for domestic driveway or pedestrian use, offering strong performance and a clean aesthetic.

Key Features

• Clear opening: ~ 450 mm (round) for inspection chamber / riser match

• Square outer frame: ~ 560 mm × 560 mm with 80 mm frame depth for stable installation

• Material: Polypropylene (PP), solid top, with slip-resistant surface

• Loading / strength: 35 kN (≈ 3.5 tonnes) — suitable for pedestrian/domestic driveway contexts

• Round-to-square design: round lid & seating, square frame surround — great for square paving layouts

• Secure fitting: locking cover options and extended frame lip for leveling

Benefits

• Aesthetic integration: lets you use square paving or slabs around a chamber without showing the round lid—neater finish in paved or block surfaces

• Safety & slip protection: tread pattern and solid lid help prevent slips; secure cover reduces movement or accidental displacement

• Durability: Polypropylene construction and robust load rating mean it holds up under environmental stress and expected loading

• Ease of installation: Frame depth and lip allow leveling with surrounding surface finishes rather than cutting or major adjustment

• Value & versatility: Solid top, locking features, and compatibility with standard 450mm circular openings make this a well-rounded (pun intended) solution for chambers needing a square appearance

For more drainage fittings, see here.