Is it compatible with 110mm drainage systems?

Yes. The UGH3 connects via a 110mm spigot and conforms to BS EN 1401-1.

What pipe sizes does the UGH3 hopper connect to?

The UGH3 is designed for 110mm underground drainage pipes and connects to standard 68mm square or 65mm round downpipes via the inlet.

Does this hopper need a water seal or trap?

No, the UGH3 is an open hopper without an integral trap. If a water seal is required for your application, you'll need to install a separate trapped gully downstream.

What's the maximum flow rate this hopper can handle?

The UGH3 can handle high flow rates typical of domestic rainwater applications, though exact capacity depends on your specific installation and pipe falls. The square design maximises water collection efficiency.

Can I install the UGH3 under block paving or concrete?

Yes, the hopper is designed for installation under paved surfaces including block paving, concrete, and tarmac. Ensure adequate access for maintenance and use a suitable cover plate rated for your traffic loading.

What type of cover or grate fits the UGH3?

The UGH3 requires a separate cover plate or grate designed for square hoppers. Choose covers rated for your specific loading requirements, whether pedestrian or vehicular traffic.

How deep should I set the UGH3 below the finished surface level?

Install the hopper so the rim sits just below your chosen cover plate, typically 15-25mm below the finished surface level. This allows proper seating of the cover whilst maintaining adequate fall to the outlet.

What bedding material should I use around the UGH3?

Use concrete haunching around the hopper body for stability, with a granular bedding material like pea shingle beneath. Ensure the outlet connection remains accessible and properly supported.

Is the UGH3 compatible with other manufacturers' 110mm drainage pipes?

Yes, the 110mm outlet uses standard PVC-U pipe dimensions compliant with BS EN 1401-1, making it compatible with most UK drainage systems and pipe manufacturers.

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 FloPlast 110mm Underground Square Hopper (UGH3) is a compact PVC-U fitting for managing rainwater and surface drainage systems. Designed to BS EN 1401-1, it provides a reliable connection between downpipes and underground drainage, handling high flow rates in compact areas.

Its durable square body is impact-resistant, easy to install, and built for long service life — ideal for driveways, patios, and paved areas where a tidy finish matters.