What is this cover used for?

Provides a secure, sealed cover for 300mm inspection chambers, preventing odour and water ingress.

Is it suitable for driveways?

A15-rated for pedestrian and garden areas — not for vehicle traffic.

What size inspection chamber does this cover fit?

This cover is designed specifically for 300mm inspection chambers, despite being 340mm square itself to provide proper overlap and sealing around the chamber opening.

Is this cover suitable for vehicle traffic areas?

No, this domestic-grade polypropylene cover is designed for pedestrian areas like gardens and light foot traffic only. For driveways or areas with vehicle access, you'll need a heavy-duty cast iron or composite cover.

How does the sealing work to prevent odours?

The screw-down mechanism compresses a built-in seal around the frame perimeter, creating an airtight barrier that prevents drainage odours and gases from escaping.

Can I install this cover without the matching FloPlast chamber base?

Whilst it's designed to work optimally with the FloPlast UGMBS 300mm Chamber Base, it can fit other 300mm chambers provided they have the correct rim dimensions and are level.

What tools do I need to open this cover once installed?

You'll need a suitable screwdriver or electric drill with the appropriate bit to remove the screws. The specific screw type will depend on what's supplied with your particular unit.

How deep can I install this with the FloPlast riser system?

When used with FloPlast UGRS 300mm Riser Pieces, you can achieve various depths by stacking multiple risers, though you should check building regulations for maximum depths in your specific application.

Will this cover sit flush with paving or does it need a recess?

The cover requires a properly constructed frame recess to sit flush with your finished surface level. The frame depth should be factored into your paving or surfacing installation.

What's the difference between this and a standard hinged cover?

Unlike hinged covers, this screw-down version provides superior sealing against odours and water ingress, but requires tools to access the chamber rather than simply lifting a hinged lid.

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Fascias, Guttering, Windows & More

The 340mm Square Sealed Screw-Down Plastic Cover & Frame is a secure, durable solution for 300mm inspection chambers.
Designed to protect underground drainage systems from ingress and odour, the screw-down lid provides a tight seal for domestic applications.

Manufactured from robust polypropylene, it’s compatible with the UGMBS 300mm Chamber Base and UGRS 300mm Riser Piece, forming part of 300mm chamber system.
Ideal for gardens, driveways, and paved areas where extra protection and sealing are required.