What is the 450 mm riser piece for?

It is used to raise the height of an inspection chamber by 235 mm, allowing the cover to match finished ground levels.

Does it include the sealing ring?

No — the UGRL riser piece is supplied without a sealing ring, which must be ordered separately if needed.

Which bases and covers are compatible?

It matches the FloPlast 450 mm chamber base (UGMBL) as well as 450 mm covers like MCCRPL and MCCRCI.

What height does the UGRL riser piece add to my inspection chamber?

The FloPlast 450mm Riser Piece adds 235mm of height between the chamber base and cover, allowing you to adjust the final chamber depth to match ground levels.

Which chamber base is this riser piece compatible with?

This riser piece is specifically designed for use with the FloPlast 450mm Chamber Base (UGMBL) and will not fit other manufacturers' systems.

Can I stack multiple UGRL riser pieces if I need more height?

Yes, multiple riser pieces can be stacked together to achieve greater depths. Each additional riser adds another 235mm of height to your inspection chamber.

What covers and frames will fit on top of this riser piece?

The riser accepts all standard 450mm covers and frames, including FloPlast's MCCRPL and MCCRCI models, maintaining the standard 450mm diameter throughout.

Do I need a sealing ring between the riser and chamber base?

Yes, a sealing ring is essential for watertight performance but is sold separately. You'll need to order the appropriate sealing ring for your installation.

Is this riser piece suitable for adoptable sewers?

Yes, the UGRL is manufactured from PVC-U and complies with BS EN 13598-1, making it suitable for adoptable sewer applications when installed correctly.

What's the internal diameter of the riser piece?

The internal diameter matches the FloPlast 450mm chamber system, providing consistent bore throughout the chamber depth for proper flow and access.

Can this riser be cut down if I don't need the full 235mm height?

Yes, the PVC-U construction allows the riser to be cut to your required height using standard plastic pipe cutting tools, though you'll need to ensure clean, square cuts for proper sealing.

top of page

Fair Prices. Real People. Quality Plastics – No Compromises.
Small Item Postage Available – Only £8.99!

Email Us

HELP CENTRE

Your Nationwide uPVC Building Plastics Supplier

01922 254100

Fascias, Guttering, Windows & More

The 450mm Riser Piece (UGRL) increases the depth of an inspection chamber, adding 235mm height between the chamber base and cover.

It’s designed for use with the 450mm Chamber Base (UGMBL) and accepts standard 450mm covers and frames, such as MCCRPL and MCCRCI.

Manufactured from robust PVC-U and compliant with BS EN 13598-1, it ensures long-term watertight performance when fitted with the appropriate sealing ring (sold separately).

⚠️ Note: Sealing ring not included. Order separately if required.

Compatible with FloPlast and other standard underground drainage systems.